The Johnsongrass Problem

This summer in my travels through Kansas and surrounding states, I have seen more Johnsongrass than ever before. It is everywhere. It has proliferated to the point that it is pushing out native vegetation, including remnant prairies and most roadside ditch prairie plants. The expansion of this exotic grass is so aggressive that I am afraid that nothing can be done to reverse the trend in most of the areas that I see. It is a travesty.

Johnsongrass has a narrow leaf blade similar to milo or sorghum and a panicle seedhead similar to switchgrass.

History

Johnson grass, or sometimes Johnsongrass, Sorghum halepense, is native to Asia, North Africa, and the Mediterranean. It was introduced in the U.S. around the 1800s and is named after Alabama plantation owner Colonel William Johnson who is said to have actually planted a crop of the grass on river bottom land in 1840. However, Johnson grass had been established in several other states about a decade earlier.
It was originally considered a prospective forage crop but Johnsongrass turned out to be an agricultural weed. The unintended consequence of Johnsongrass introduction was that it caused tremendous economic loss due to its invasive spread by seed and rhizomes. Cash crops were pushed out and livestock were poisoned by the plant. Today, it is considered one of the ten worst weeds in the world, especially for range land.

This grass was promoted as good for cattle grazing and hay, but it has had the opposite effect. It is very hard to eradicate once it gets a foothold. If you try to plow it under, it simply spreads more plants similar to tilling a stand of bermudagrass. Plants stressed by drought or freezing weather will produce hydrogen cyanide (prussic acid), which will kill livestock when the grass is eaten in larger quantities. Horses and repeat grazers are most susceptible to harmful effects such as bloating or death.

Johnsongrass colony along a stream bank in Hesston.

Control

You may ask, then, what can be done? Small stands can be hand pulled, dug up and monitored for resprouting, but you must be diligent and vigilant to make sure you have removed the entire plant. Scouting the peripheral edges of you property and immediate eradication with Round-Up is the best.

Always use caution when using any chemical including Round-Up. I hate to spray, but in this case, an application of glyphosate/Round-Up is warranted. Round-Up is a non-selective herbicide that will kill any plant it is sprayed on, so care has to be taken when applying it. Again, monitor and respray the sprouts that pop up after the original burn down.

You must be vigilant. A few years of growth of Johnsongrass unchecked can have very dangerous consequences to your prairie or landscape. We can’t reverse all the damage already done, but we can keep it from damaging your corner of the world. It takes some effort to keep invasive species at bay, but it is always worth it.

Searching for Bigfruit Primrose

I was recently invited to Liberal, Kansas to give a talk to a garden group. While I enjoyed meeting and chatting with the knowledgeable and enthusiastic gardeners of the area, the best part of the trip was the detour we took to Clark State Fishing Lake. I knew a special subspecies of primrose grows there, and I was eager to collect a bit of seed. My partner and I spent an hour or so, on a balmy 100 degree day, seed collecting.

Broomweed (Gutierrezia dracunculoides) in the foreground, Clark County Fishing Lake seen in the distance.

A Unique Oppourtunity

Because I am rarely in the southwest corner of the state, and at this time of year the seed would be plenty dry and ready to collect, this was a serendipitous moment. I went in search of Oenothera macrocarpa subspecies incana. This regionally-specific primrose grows only in southwest Kansas and parts of the Texas and Oklahoma panhandles. While Oenothera macrocarpa is already a drought tolerant wonder plant, withstanding intense heat and dry weather like a champ, this subspecies may be even more adapted to drought based on its native range. Collecting and propagating seed from subspecies and species with historically small ranges allows us to offer more regionally specific plants to our western Kansas customers, and also brings greater genetic diversity to the Arboretum grounds.

According to USDA Plants Database, Oenothera macrocarpa ssp. incana has a limited range, and grows on some very hot, unforgiving terrain.

Late Summer Treasures

I was checking these Amorpha nana (dwarf false indigo) seeds for viability, before shoving them in my pocket, likely never to be found again.

While scouring the hillsides for primrose, we found lots of other familiar faces. There were seas of buffalo grass and blue grama to admire, growing happily even in a long standing drought. I even saw three different Amorpha species! Amorpha nana and Amorpha canescens were growing up in the dry hill sides, and Amorpha fruticosa was growing along the edge of the lake. I also encountered a completely new species for me, Stenosiphon linifolius. This member of the primrose family is called false gaura, and while it looks nothing like the primrose I was actually searching for, it gave me hope we were in the right place!

Fruits of Our Labor

I collected seed from a few species, but I do so carefully; never taking the entire supply of that location and trying not to disturb the plants too much. Seed collection must always be done with the health of future generations of plants in mind! I took two seed pods of Mentzelia nuda, one small pod of Asclepias hirtella, and a few tufts of Heterotheca canescens. All of these species would be new to our FloraKansas Native Plant Days, if I can successfully grow them.

The lake is surrounded by hills, which makes for scenic views. The water was very low, but there were still many birds about, and lots of turkey vultures circling above.
Bigfruit primrose (Oenothera macrocarpa) has large seed pods shaped like starfruit except with only 4 points. These are the type of pods we were searching for.

We walked the hills for an hour or so, driving to several locations around the lake to try our luck. It has been a very dry summer, so perhaps the plants had dried up? We saw lots of grassy debris built up, maybe it was hiding just under the next tuft?

It was terrifically, fantastically, abominably hot that day. Eventually the sun won out against our will to find the primrose and we left without finding it. I hope to visit again in spring, when they might be blooming. Then I could pin their location on my phone’s GPS so I might find their seeds easier in the fall.

Two people who should have worn more sunscreen and drank more water, but had a blast on the shortgrass prairie!

Shortgrass Prairie, Big Blue Sky

If you have the time, make a day trip to western Kansas and take in all that the shortgrass prairie has to offer. It is often overlooked as less scenic or showy than the tallgrass prairie, but I disagree. Its diminutive species and rocky outcroppings have a rugged charm that reminds me of old western movies. And the endless sunny skies remind me of the resilience that these plants must have to survive. If any of you readers do visit Clark County Lake, keep an eye out for the seeds of this much-sought after primrose! I would happily seed swap for it.

Shade Plants in Their Natural Habitat

On vacation in early July, some friends and I explored Devil’s Lake State Park, Wisconsin. Rocky and rainy, with lushly forested slopes, it is a very different landscape from my beloved Kansas. While hiking I saw many of my favorite shade plants living in situ, outside the confines of our carefully cultivated gardens. To spot them in their natural habitat is always a thrill!

Devil’s Lake State Park offers well kept hiking trails, rock climbing and water recreation.

Jack-in-the-Pulpit

Jack-in-the-Pulpit was growing along the hiking path ringing the lake. Easy to confuse with poison ivy because of its three leaves, colonies of them grow in part sun locations. In early spring their fluted blooms appear, inconspicuous in yellow and brown. In hot locations they will conserve their energy and go dormant for the summer.

Arisaema triphyllum, Jack-in-the-Pulpit

Ferns

Ferns were growing out of every crag, reaching their delicate fronds upward. Kansas does actually have many of our own native ferns, but they are much harder to find than those in wetter climes. I was really having a hard time keeping up with our hiking group because I was so fascinated by the diversity of ferns around us! I saw christmas ferns, lady ferns and wood ferns all in less than a mile’s walk.

The dots on the underside of the fern frond are spore clusters called ‘sori’.

Coral Berry

I also saw groups of coral berry (Symphoricarpos) growing in the understory, their fruits shining in the dappled light of afternoon. There are lots of cultivars of this plant quite suitable for sunnier locations. They make wonderful bushes for foundation plantings or filler amongst other shrubs.

Luckily you don’t have to go all the way to Wisconsin to see these beauties. All the plants listed in this post will be available at our fall FloraKansas Native Plant Festival fundraiser! Call or email Arboretum staff for more information.

June Prairie Blooms

This past week I had the opportunity to trek into the Flint Hills.  I always enjoy spending time immersed in a prairie setting.  It makes me feel small in a great big world.  It makes me keenly aware of the great diversity and complexity of the prairie ecosystem.  It also reminds me how precarious these settings are and how important they are to our survival and the life cycles of so many different things.  Here are a few of the prairie blooms I saw in June:

Catclaw sensitive briar (Mimosa quadrivalvis var. nuttallii

The vibrant pink disco balls of catclaw sensitive briar stand out in the landscape.

Narrowleaf Coneflower (Echinacea angustifolia)

Narrowleaf Coneflower

Leadplant (Amorpha canescens)

The silvery green foliage and dark purple blooms of leadplant are striking in the landscape.

Black-eyed Susan (Rudbeckia hirta)

Millions of these bright yellow blooms dot the prairie hillsides.

Bee balm (Monarda fistulosa)

These flowers are a favorite of many pollinators.

Prairie Coneflower (Ratibida columnifera)

Columnar coneflower reaching for the sky

Butterfly milkweed (Asclepias tuberosa)

Butterfly milkweed (Asclepias tuberosa) Photo by Brad Guhr

Sullivant’s Milkweed (Asclepias sullivantii)

Large pink clusters of blooms on Sullivant’s Milkweed Photo by Janelle Flory Schrock

This is just a handful of flowers blooming right now in the Flint Hills. With all the rain, the prairies are lush and full of life. I would encourage you to take time to find a prairie near you, even our own Prairie Window Project, and enjoy our native habitat. I was amazed how alive the prairie was with sights and sounds of wildlife and pollinators. It was worth taking in the view of earth and sky.

Flower Power: Learning the Language

Spring blooming plants are just beginning to fade and early summer blooms are coming on strong. At least once a day Arboretum staff members answer the question,

“What is this flower?”

Sometimes someone shows us a photo or has a cutting of something they saw on the roadside. More often than not, however, they try to describe it to us. This is not an easy task if you don’t speak the language of flowers. For instance, if you tell my coworker Brad Guhr that you saw a round flower, he might ask you what you mean by round, and whether it was radial or globulose. There is a lot of special lingo out there concerning flowers. Here I will clarify a few common botany terms relating to flowers, and though they sound complicated, they really simplify the identification process. Learning these terms also teaches us to look closer and longer, becoming better observers.

A french poster showing the terminology related to flower position.

Inflorescence is a word you will hear often around botanists. This is just a fancy word for the complete flower head of the plant including bracts and stems. Sometimes it is even used as a verb, a synonym to ‘flowering’.

Composite flowers are special inflorescences that seem like one flower, but are actually many flowers put together. Sunflowers are a good example of a typical composite flower. Their center is made up of hundreds (sometimes thousands) of disc flowers that mature into seeds. The yellow petals of the sunflower are ray flowers (or ray florets) and do not create seed. Some composites are made up only of ray flowers, like dandelions. Some composites are solely disc flowers, like our native thistles.

The rounded head of echinacea that attracts pollinators is made up of hundreds of tiny disc flowers. The purple petals are ray flowers.

We can further describe some composite flowers as spikes. To be a true spike, each individual flower is directly attached to the main stem, like gayfeather. If the individual flowers are held away from the main stem by smaller stems (pedicels), they are called a raceme. Penstemon and coral bells are both good examples of racemes.

Penstemon digitalis flowers are clustered together on a raceme.
Agastache foeniculum is a true flower spike becuase its individual flowers are directly attached to the main stem.

Umbel flowers are some of my favorite for use in floral arrangements. These are flat topped clusters of flowers on short flower stalks, spreading from a common point. Dill, carrot, and fennel all have umbels. As the name suggests, the arrangement of the flower stalks is reminiscent of an umbrella.

Achillea looks like an umbel inflorescence, but the short stalks that hold the flowers do not all originated from the same point on the stem. It is actually a corycomb, a type of raceme.

These are just a few basic flower terms that can help you begin to identify unknown plants. Keep a look out for more installations on the topic of descriptive plant language. Now get out there and botanize!

Kansas Native Ferns

At FloraKansas Native Plant Festival our customers were surprised to see we offer Kansas native ferns. Perhaps they were surprised to hear Kansas even had native ferns! With our hot, dry summers and deep-freeze winters, Kansas does not seem like hospitable environment for delicate, shade loving plants. However, we have several naturally occurring fern species in the state that are hardier than you might think. They are fascinating to observe growing in the wild, but also make excellent additions to your shade garden.

Royal Fern

Osmunda regalis var spectabilis


According to fossil records, the royal fern family (Osmundaceae) dates back about 365 million years. 3 to 4 feet tall (shorter in poor, drier soil), this fern becomes a large and impressive specimen in the shade garden. O. regalis var spectabilis grows happily in the far eastern part of Kansas and throughout the eastern third of North America. Royal fern has attractive bright green foliage and rust colored spore plumes. It prefers moist, somewhat acidic soil and shade though it can handle sun if the soil is kept wet. This fern can live up to 100 years if planted in the right location!

Royal fern is an easterly species, occurring from the Ozarks through the southeastern US and north into eastern Canada.

Christmas Fern

Polystichum acrostichoides

This festive native fern grows in far southeastern Kansas. According to Missouri Botanical Garden, it “…typically grows in a fountain-like clump to 2′ tall and features leathery, lance-shaped, with evergreen (green at Christmas time as the common name suggests) fronds.” If you love boston ferns but want something perennial, this is a great option. When planted in an average moisture, shaded area it will spread slowly to form a colony.

If you are up for some botanizing, head to these southeastern counties in moist, partially wooded areas to catch a glimpse of these ferns.

Sensitive Fern

Onoclea sensibilis

Onoclea is unique native fern, with arching fronds and oblong, creeping rhizomes. Getting its name from sensitivity to frost, O. sensibilis is surprisingly hardy. It can easily survive the cold dry winters in Kansas, Nebraska and even the Dakotas. This species is native to the eastern half of North America as well as far eastern Russia and China. According to Wikipedia, you can help your ferns survive the winter by leaving dried fronds on the plant instead of clearing them away.

There are many more native ferns I could include here, from the marginal woodfern found in Wilson, Elk, and Greenwood counties to the tiny rock ferns growing among the monoliths at Rock City in Minneapolis, KS. Get out and do some fern hunting, or buy a few at our fall sale to enjoy for years to come.

Fungus Among Us

Working on the Arboretum grounds means I have the joy of interacting with native plants and animals every day. I get to watch newly-planted trees sprout their first leaves and newly hatched goslings sprout their first feathers. I see migratory birds on their way north and south, caterpillars turning into butterflies, spiders wrapping up their breakfast of grasshoppers, and the cozy tunnels made by fastidious skunks and armadillos. But by and large my favorite living thing to observe here at the Arboretum is fungus.

That’s right – that crusty yet slimy, multicolored, spore-producing stuff that grows quietly all around us.

If you want to acquaint yourself with the world of mushroom identification, buy yourself a small, simple guide to get started. I got this handy book for only $2 at the UW Madison Arboretum gift shop and have found it very useful for beginners.

Fungi is a much misunderstood life form (and no, I am not just talking about my coworkers Brad and Scott, fun guys though they are!). While people often come to visit Dyck Arboretum to watch birds or spot their favorite wildflowers, I have yet to hear anyone shout in delight, “Guys, look over here! A stinkhorn mushroom colony!” And such a shame – I have seen so many weird and wonderful fungus (and fungus-like) creatures at the Arb that I can’t help but be enthralled by them.


In our Prairie Window Project the dense mat of grasses and plant debris create a rich environment for fungus. These tiny mushrooms, only the size of dimes, were scattered throughout a ten-foot square area.

Plant or Animal?

Perhaps you noticed I used the word ‘creature’ for fungi in the above paragraph. Aren’t mushrooms just strange, fleshy plants? No. Technically speaking, a fungus is genetically more similar to you and me than it is to a plant. In scientific nomenclature, fungi occupy their own Kingdom (there are 6 major Kingdoms of life, for animals, plants, bacteria and so on). Fungi do not photosynthesize like plants, and cannot make their own food (autotrophy). Like us, they must feed on other organisms to survive (heterotrophy). Fungus do not have roots, stems or leaves, and do not store energy as a starch like plants do. They reproduce by releasing spores into the environment, or by simply breaking apart (fragmentation) or budding (growing a clone).

I spotted these beautiful shelf fungi growing on a fallen log at UW Madison Arboretum.

What am I Looking At?

The first step into nerding out over fungus is to classify your observations. It is a tricky job, and scientists today are still in a tizzy about the genetic ancestry of fungus. For the layperson, let’s stick to the basics: yeasts, molds, and mushrooms are all types of fungus. Mushrooms are perhaps the most charismatic and well known fungi – shelf-like, gelatinous, or toadstool shaped, they spring up seemingly overnight. What we see as a ‘mushroom’ is only a small part of the organism, just the fungus’s reproductive organ. The rest of it exists as a massive web of string-like hyphae in the soil or decomposing wood.
There are several trees around the Arboretum in various states of natural decay sporting impressive shelf fungi. (Or perhaps they are spore-ting it?) But don’t be fooled – lichen, commonly found growing on trunks and tree branches, is NOT fungus. It is actually a combination-creature; algae, cyanobacteria, and fungus all sharing a body to create a new being, with an endless array of forms.

I see some flat grey lichen growing here, but I can’t tell if these charming little white growths on our Prunus virginiana are lichen or fungus – they cling like lichen but the sort of soft, furry characteristic of fungus. Perhaps a reader can help me out on this one!

Where to Look

People may assume Kansas is not a good place to find fungus – much too dry and hot. Not only do we have some delicious edible mushrooms growing wild in Kansas but a plethora of other fun-to-hunt (but potentially toxic!) fungus. In fact, they grow almost everywhere on the planet and have countless forms, colors, and methods of life. Scientists only know of 120,000 species, but estimate there are millions more waiting to be discovered.
To find your first fungus, search around decaying wood piles or heavily mulched garden beds. Check carefully and often around tree stumps; different mushrooms will feed on the rotting roots at different stages of the decay.

This red-belted bracket fungi (maybe Fomitopsis pinicola?) formed on the trunk of a long dead redbud tree near our parking lot. This beauty was almost 12 inches across!

On your next visit to Dyck Arboretum, be sure to get a peek at some magnificent fungi on our grounds. Hunting for fungus, in all its forms, is a meaningful way to interact with nature and build a relationship of wonder and respect for the land we live on.

Waking Up: The Exciting Life of Buds

The landscape may still be dominated by the browns and tans of winter, but inside the greenhouse is a different story -oodles of green buds bursting out of dormancy, waking up to warm, humid air! It’s refreshing to spend time around these green little beauties, and it is an indicator that plants outside will soon be doing the very same thing.

Buds excite us for many reasons. They portend flowers and color, and the lush greenness to come. But they also are a signal of life! Life after the cold winter months, life after dormancy – a breaking forth from a long sleep, part of the natural cycles of activity and inactivity that we all experience.

Beyond metaphor, their botany is just plain cool! Here are a few things to know about the buds emerging on your landscape plants at home.

Salix Mt. Asama is an early bloomer. It’s bright yellow and pink pollen clusters are showy, suspended on fuzzy, whimsical silks.

What is a Bud?

A pal? A friend? I certainly see them that way! But scientifically speaking, a bud is an embryonic shoot just above where the leaf will form, or at the tip of a stem. As I previously covered in my November post on pruning, there are lots of different types of buds: terminal buds (at top of stem), lateral buds (on sides of stem, producing leaves or flowers), dormant buds (asleep and waiting for spring), and many more.

Buds can be classified by looks or location.
By Mariana Ruiz Villarreal LadyofHats [Public domain], via Wikimedia Commons

 

‘Confetti Cake’ hellebore has a pure white flowerbud, but when it opens will be spotted with dark purple.

Bud Beasties

Inspecting your buds is important to stopping a potential problem. The first thing to inspect for is aphids. Buds are succulent little treats for these pests, and have less waxy protective coating than mature leaves, making them an easy target. Often the buds won’t show much damage until you have a nasty infestation, so inspecting buds early is key. Be sure to look on the inner folds of the bud if possible, as aphids are quite good at hiding themselves.

Ogon spirea blooms earlier than other spirea, long before it has fully leafed out. The flowers are white with yellow centers and closely clustered together, making a nice effect in the spring landscape.

Health Check

Even if you see buds on your trees, shrubs and outdoor plants, that may not be an indication that everything is A-OK. All too often I see lots of buds on my potted shrubs only to find out that they are dead – by pressing gently on them, they easily break off and reveal dead wood at the wound. If you have any doubt about the hardiness of a shrub or perhaps neglected your winter watering schedule, take a close look at the buds. Buds that are soft and mushy or dry and brittle are a bad sign, and may indicate dead wood that needs trimming back this year. Firm buds that don’t break off at a light touch, be they green or still brown, usually mean they are alive and waiting to spring open.

I’m dismayed that FloraKansas Plant Festival is still months away – so many early blooming plants are at their best right now, budding out and coming alive! Come visit the Arboretum and enjoy all the buds (and bulbs!) that are waking up!






Know Your Native Plant Families

As we approach our Native Plant Landscaping Symposium on February 24, where speakers will tell stories about their favorite native plants, they may make reference to using certain families of plants. Thinking about the organization of plants in this way makes landscaping with native plants even more interesting.

In a way, native plants are like people. The closer people are in genetic relation to each other, the closer they resemble each other. Family members share skin color, body type, hair texture, and facial features. While a unique name is given to each person to recognize their individuality, part of that name is kept the same and recognized both with close and distant relations. These closely-bonded people develop similar habitat preferences and interact with their environment in similar ways.

In 1758, Swedish botanist Carl Linnaeus developed a Latin naming system for plants and animals. Each plant or animal was given a “genus” (generic name) and “species” (specific name). Plant families include genetically related plants share floral structures, leaf arrangements, and stem shape. Multiple genera can make up a family. Along with the scientific name, people have also given each plant species many common names or nicknames.

Asclepias incarnata, otherwise known as swamp milkweed or marsh milkweed, is a member of the DOGBANE FAMILY.

For example, plants in the DOGBANE FAMILY have five-parted flowers, opposite leaves, and a milky juice in the stems and leaves with a bitter-tasting, toxic compound that protects the plants from being eaten by insects (excluding monarch butterfly larvae). In this family, the milkweed genus (Asclepias) has 22 different species in Kansas. You may not recognize from their common names that butterfly milkweed and green antelopehorn are related, but when you see their Latin names, Asclepias tuberosa and Asclepias viridis, you will know better.

Kansans have many good reasons for landscaping with native plants. Some of the best benefits are: 1) they provide natural beauty throughout the seasons, 2) they attract pollinators and other wildlife that are part of the food chain, 3) they offer drought-tolerant, environmentally-friendly plants to work with, and 4) they represent our state’s rich prairie natural heritage. By learning more about native plant families, you can add more diversity to your garden, creating a wider range of habitat for wildlife.

Additional plant families commonly found in the prairie, which are well represented at our plant sale, include:

SUNFLOWER FAMILY

Includes the largest number of species in the prairie; many flowers or “florets” in one head with both inner disk florets and outer ray florets.

Echinacea pallida, otherwise known as pale purple coneflower, is a member of the SUNFLOWER FAMILY.

BEAN FAMILY

These “legumes” have a distinctive five petal flower, form bean pods, and fix nitrogen into the soil thanks to special bacteria living on the roots.

Baptisia australis, also known as blue wild indigo or blue false indigo, is a member of the BEAN FAMILY.

MINT FAMILY

These plants have square stems and opposite leaves that create aromatic oils. Most garden herbs are in the mint family.

Salvia azurea, also known as blue sage, is a member of the MINT FAMILY.

GRASS FAMILY

Flowers are colorless and wind pollinated, and stiff fibrous stems help carry fire when dormant. Most agricultural crops are in the grass family.

Schizochirium scoparium, also known as little bluestem, is a member of the GRASS FAMILY.

 

Each summer at our Earth Partnership for Schools Institute, we begin our week-long K-12 teacher training with an introduction to plants through an exercise called “Plant Families”. This is a great way to give some organization to the understanding of how plants are named and classified. I think you will enjoy having access to this resource – check it out and have fun while learning your plant families! (Plant Families EPS Curriculum Activity)

Teachers examine grass flowers while learning about plant families.

 






Old Wood, New Buds: A Pruning Guide

Though true winter approaches, there are still a few warm, sunny days ahead to be filled with raking leaves and garden clean-up. Here at the Arboretum we leave our perennial gardens uncut through the winter to create winter habitat and protect the soil, but just like you, we are plenty busy piling up leaves and preparing our Christmas decorations. If the weather is truly obliging, you may even be tempted to bust out your pruning shears and neaten up your trees and shrubs. Less work waiting for you in spring, right? But be warned, overzealous and untimely snipping could cost you! Below is a seasonal summary of pruning information compiled from the four corners of the web, along with a botany primer on buds  and the old wood/new wood conundrum.

20150429Syringa vulgaris2

Don’t lose your lilac blooms, prune at the perfect time! Photo by AnRo0002 (Own work) [CC0], via Wikimedia Commons.

When to Prune What

The truth is, most plants don’t need much pruning. Pruning should never aim to distort the shrubs natural figure, only enhance its shape and thin branches to ward off disease and breakage. Gardeners often ask me when to prune their (insert flowing shrub here) for the best bloom – the truth is, I don’t have all that knowledge locked in my brain! I often whip out my phone to research the specific plant and find out if it blooms on new growth or last years wood. If a plant flowers on last years wood, pruning in winter or spring means you will cut off all the already produced dormant flower buds and greatly reduce or eliminate the coming year’s bloom. Here is a run-down of when to give some common landscape plants a haircut.

Crypemyrtle (Lagerstroemia) blooms on new growth, prune in late winter before it leafs out to get a good view of the form

Lilac (Syringa) – blooms on last years wood, prune immediately after flowers have faded, before next years buds form.

Butterfly bush (Buddleia) – blooms on new wood, so prune/shape in early spring

Buttonbush (Cephalanthus) – blooms appear on new wood, prune in late winter/early spring

Hydrangeas – very tricky, as not all grow the same! Cut back H. paniculata and H. arborescens in late winter; they bloom on new wood. H. macrophylla and H. quercifolia bloom on last years wood and can only be trimmed immediately after their blooms fade.

**A great in-depth guide to evergreen pruning can be found HERE from Morton Arboretum. But if you just want the quick dirt…

Pines – early spring just as new growth begins, but not before.

Spruces, Firs – early spring before new growth begins

Juniper, Arborvitae, Yew – late winter or early spring before new growth begins

Europaeische Eibe European Yew rot red arillus fruit frucht Taxus Baccata

Yews (Taxus) can generate growth on new or old wood, so they can tolerate heavy pruning and shaping in the early spring, then again in June if needed. Photo By Philipp Guttmann (Own work) [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons

Know Before You Cut

Surgeons go through years of rigorous schooling before they make a single cut, so why don’t we spend a few minutes learning about buds and shoots before the amputations begin, eh?
A bud is an embryonic shoot just above where the leaf will form, or at the tip of a stem. There are lots of different types of buds: Terminal buds (primary growth point at top of stem), lateral buds (on sides of stem that produce leaves or flowers), dormant buds (asleep and waiting for spring, shhh!), and many more.

Buds can be classified by looks or location.
By Mariana Ruiz Villarreal LadyofHats [Public domain], via Wikimedia Commons

In light pruning, such as pinching or heading, cut just above the bud at a 45 degree angle. Lowes has a great guide on the 4 types of pruning, and a very helpful graphic seen below. A cut too far above or below the bud may result in die-back and withered stems.

This angle is optimal for encouraging grown and also hiding your cuts. Graphic from Lowes.com, https://www.lowes.com/projects/gardening-and-outdoor/prune-trees-and-shrubs/project

Cutting directly above the bud tells the plant to release hormones signalling the bud to break dormancy and sprout! Learning about the process of plant dormancy can ensure we aren’t wounding plants at vulnerable times, The Spruce has a great article on this here.

Research first, then cut carefully, friends!