Vines: Taking Your Landscape to a New Level

Vines are underutilized in nearly every garden, in my opinion, including here at the arboretum.  It may be that we don’t have the structures to support them and show off their attributes, or we are unfamiliar with how to grow them.  Either way they need to be used more.  In fact, I think vines are one of nature’s greatest gifts to gardeners.  They can give us shade by covering a pergola, camouflage ugly elements within the garden such as sheds, poles and fences, or bring color, texture, and fragrance to a trellis or arbor.  Vines are utilitarian because they fit into almost any available space.  I need to use them more here at the arboretum, so I thought we could work through this problem together and maybe begin to incorporate these native vines to a greater extent, literally.

Trumpet honeysuckle (Lonicera sempervirens ‘Major Wheeler’) is the best selection of honeysuckle I have grown.  It has twining stems with smooth leaves that seem to be resistant to mildew.  But who grows this plant for the foliage?  I love the flowers.  In late spring, it is covered in red trumpet shaped blooms that keep coming well into summer, especially with a post-bloom trim. The hummingbirds will find it from miles around. It grows best in a medium to moist well-drained soil and partial shade.

Major Wheeler Trumpet Honeysuckle

Major Wheeler Trumpet Honeysuckle

Dutchman’s Pipe-vine (Aristolochia tomentosa) is a vigorous, climbing woody vine without tendrils. The interesting pipe shaped flowers appear in May and June.  Large, heart-shaped leaves are attractive throughout the year and turn a nice yellow in the fall.  In Kansas, it is found in the southeastern counties.  I have this vine growing in morning sun and afternoon shade.  It will need a trellis or arbor to grow on and a medium to moist soil.  Pipevine is the host plant for the Pipevine Swallowtail butterfly.

Grape Honeysuckle (Lonicera reticulata ‘Kintley’s Ghost) is a vine we have been using for several years.  We have it growing on either side of the entrance to the Visitor Center.  The gray-green leaves develop in an attractive eucalyptus pattern.  At the terminal ends of the stems the bright yellow flowers develop in spring.  It can grow in sun to partial shade and prefers an average to moist soil.  It is great in form and flower.

Grape Honeysuckle

Grape Honeysuckle

American Bittersweet (Celastrus scandens) is grown for the beautiful fruit clusters that develop during the summer and are noticed and eaten by birds in the fall.  Male/female plants are separate and both are needed to produce fruit.  Foliage is attractive on the twining stems.  It grows best in a morning sun location, but can grow in full sun if given some supplemental water during the summer.  Train along fence or over an arbor.  Celastrus scandens ‘Autumn Revolution’ is a form with male and female flowers on the same plants.

Bittersweet Fruit

Bittersweet Fruit

Passion Flower (Passiflora incarnata) develops three inch diameter lavender flowers that have a rich fragrance.  These flowers are striking and have religious symbolism.  The vines can reach up to 12’ in one year and die back to the ground during the winter.  Situate in a semi-shade area with a medium to moist soil.  I would mulch lightly to protect crown from harsh winter temperatures.

Other vines for the garden are Pitcher’s Leather Flower (Clematis pitcheri), Climbing Hydrangea (Hydrangea peteolaris), and Kentucky Wisteria (Wisteria macrostachya ‘Powell’s Purple’)

Don’t miss the opportunity to include these great vines in your garden by visiting the arboretum spring plant sale.  I tend to keep flowers at ground level but these vines will take your garden to new heights and add interest to levels not normally utilized.

For more information on these vines and other garden worthy plants visit the arboretum website at www.dyckarboretum.org.

Fremont’s Clematis: A Rare Beauty

The other day, I began transplanting seedlings of Fremont’s Clematis for our FloraKansas spring plant sale.  I was thrilled that we actually will have some to offer this year.  In the past, we have struggled to achieve germination, but this year we have been successful.

Fremont's Clematis Seedlings

Fremont’s Clematis Seedlings

The seed from which these plants germinated was collected last summer, as our staff took a detour on our way back from a retreat at the Flinthills Discovery Center in Manhattan.  The seed germinated last fall and overwintered in the seedling flats.  Over the past few weeks they have really come to life and it was time to move them before their taproot grew too large.

Fremont’s Clematis, or Clematis fremontii, a rare prairie native from Kansas and Nebraska, is quite different from the traditional climbing clematis species.  It forms a small bush that is covered in spring (late-April) with sugar-bell shaped flowers of purple and white.  Each flowers curls at the end.  The oval leaves are leather tough and covered with fine hairs, almost fuzzy in appearance.  These plants, once established, are resilient.  They develop into large clumps.  We have had several plants in the same spot for over 15 years, in one of the xeriscape beds just outside the Visitor Center entrance.

FremontsClematis2014

Fremont’s Clematis loves sun.  We collected the seed from plants on a rocky hillside in central Kansas.  They are thriving in that windswept exposed prairie.  If they are thriving there, then all they need is plenty of sunlight (at least 6 hours) and a well-drained soil.

I always look forward to their arrival in spring.  They are one of the first plants to emerge and bloom in our rock garden here at the arboretum.  If they are happy, they will give you years of consistent beauty. Be sure to come early to the FloraKansas Plant Sale and get some while they are available!

 

Five Oaks for the Kansas Landscape

The strongest oak of the forest is not the one that is protected from the storm and hidden from the sun. It’s the one that stands in the open where it is compelled to struggle for its existence against the winds and rains and the scorching sun.  – Napoleon Hill

If you live in Kansas long enough, you really begin to appreciate trees.  They endure heat and extreme cold along with persistent wind.  Months without rain are common, but so is the occasional soaking rain that saturates the soil.  Trees in this part of the world need to be resilient.

Folks in areas of the country that have an abundance of trees often take trees for granted.  Trees grow easily, but not here.  A good shade tree in Kansas is a luxury.   They need to withstand the rigors of the climate.  To sit under a mature tree on a warm afternoon, enjoy the blue skies and sip your favorite cool drink is a special experience.

Here are five oaks trees that are “plains tough”.   (This is my list, but there are over 10 species of oaks native to Kansas and several other non-native varieties that are equally tenacious.)

OAK TREES FOR KANSAS

1. Bur oak

When I go fishing along the Cottonwood River, I can’t help but notice the huge Bur oaks (Quercus macrocarpa) stretching out their limbs over the river.  West of Hesston, there is one that has a span of over 150 feet.  It is quite a specimen.  This native oak of the eastern two-thirds of Kansas is one of the most adaptable hardwood trees in Kansas.  Generally, it is slow growing, but in the right conditions it can grow two to three feet a year.  Mature height is 50 to 80 feet tall and with a spread from 40 to 60 feet. The Bur oaks don’t typically have great fall color, but it is very sturdy and problem-free.

Bur Oak

Bur oak

 

2. White oak

As part of my horticulture classes at Kansas State University, I had to learn the names of many different plants on campus.  One of the trees I remember the most is a white oak (Quercus alba) on the east side of campus.  It is a beautiful tree with great fall color.  This stately tree stood about 60-70 feet tall with a spread of at least 60 feet.  I would love to have that white oak in my back yard, because I know that it would be there for generations.

White oak

White oak

 

3. English oak

The Kansas state champion English oak (Quercus robur) is in Kinsley.  If it can grow in Kinsley, it can grow anywhere in the state.  It is native to Europe, but a versatile tree in Kansas.  Typical growth is 30 to 50 feet in height and 30 to 40 feet in spread.  Leaves are dark green throughout the year.  They eventually turn brown, but stay on the tree much of the winter.  This tree adapts to most soil types, including heavy clay.  Ours at the arboretum puts on good growth each year – one to two feet.  Give it room to grow and you will be rewarded with an excellent shade tree.

 

4. Shumard (red) oak

The fastest growing member of the red oak family is Shumard oak (Quercus shumardii) making it a great choice for the home landscape.  Its native range is eastern Kansas along moist streams and upland rocky hillsides.  It is quite adaptable to a wide range of soil conditions.  The fall color can be incredible.  It is recommended that you choose your tree in the fall when they are coloring because the species can be variable in fall color intensity.  Shumard oaks are more tolerant than other red oaks of urban areas and challenging sites.

 

5. Shingle oak

Our shingle oaks (Quercus imbricaria) this fall have been spectacular.  The red fall color was more brilliant than in previous years.  The color fades, but the leaves will persist through most of the winter.  Speaking of the leaves, they are unusual among oaks.  They don’t have lobes, but are smooth along the margins.  It is a great form that can thrive in drier conditions.   They grow 40 to 60 feet tall and spread 30 to 50 feet.

Shingle oak

Shingle oak

 

Planting an oak today is like leaving an inheritance to future generations.  Choose wisely!

Three Iconic Prairie Grasses to Add to Your Landscape

Native grasses are at their best right now.  They are in full plumage.  They are changing color from green to bold reds, yellows, and oranges.  They have reached their full height.  They are spectacular.

I can’t imagine the view atop a rise looking over the expanse of the Great Plains in its unbroken state – a “sea of grass” as far as you could see.  It must have been awe inspiring. Within these waves of gold and green, three grasses stood out from the rest.

Within these waves of gold and green, three grasses stood out from the rest.

Big Bluestem (Andropogon gerardii)

This is the king of the prairie grasses, reaching to the skies and sending its roots deep.  It perseveres in tallgrass prairies.  The vertical stems stand firmly and sway with only a slight breeze and change vibrantly in the fall to shades of red and orange.  The three-pronged seed heads resemble a turkey’s foot, hence its other name “Turkey Foot Grass”.  Plant it in full sun in a medium to moist soil.

 

Big Bluestem3

Switchgrass (Panicum virgatum)

The airy seed heads and upright habit make this a great landscape grass.  These forms make quite a statement in the fall and winter landscape.  They add structure, texture and movement.  For best results, plant them in a sunny spot in a medium to moist soil.  It is very drought tolerant.  Discover these varieties: ‘Northwind’-consistent upright form to four feet tall and golden yellow fall color, ‘Cheyenne Sky’-red leaves develop early in the summer and grows to three feet, and ‘Dallas Blues’-tall (to 8 feet), with blue foliage and purple seed heads.

Panicum Northwind.resize

Indian Grass (Sorghastrum nutans)

The yellow/tan plumes and vase-shaped habit make this grass easy to recognize in prairies.  I use them in naturalistic plantings or formal plantings.  Give them space, because mature plants can be five feet across the top.   It grows best in a medium to dry soil and all-day sun.  Heavy clay soils make it robust, but it thrives in many different soil types.

Indian Grass

 

These native grasses are the backbone of the tallgrass prairie.  They are resilient because their roots go deep making them drought tolerant and tough.  They are garden-worthy and deserve a place in the landscape.  Give them a try.  You will be rewarded for many years to come.

Check out this article in Fine Gardening that I wrote several years ago for more information on other native grasses.

Five Elegant Perennials for the Summer Landscape

Lately, I have been watching old Western films.  John Wayne always looks so calm and collected.  He never sweats, even though he is wearing five layers of clothing.  Have you ever wondered why they wear so much when it is so hot?

Right now, I wish I had a sprinkler to run through or a bucket of ice water to dump on myself.  Those movie characters who ride through the desert unscathed remind me of some tough plants blooming right now in the arboretum.  It is a true testament to the toughness of some perennials that thrive in adverse conditions.

Try these sun-loving perennials – you will be rewarded year after year by these resilient plants:


Letterman’s Ironplant-Vernonia lettermanii ‘Iron Butterfly’

While walking through the gardens this morning, I noticed the vibrant purple blooms of this iron-clad wildflower.  We should be tooting the horn for more natives like these.  The plants were alive with activity-like a pollinator magnet!  Each stem has slender leaves radiating outward, similar to Amsonia hubrichtii.  This is a more refined ironweed, but just as tenacious as the pasture type.  I use them in groupings with switch grass and goldenrods but they would be a nice addition to any landscape.

Vernonia Iron Butterfly

Photo taken at Dyck Arboretum of the Plains

 


Russian Sage-Perovskia atriplicifolia

On my recent trip to Denver, Russian Sage was ubiquitous.  That’s a fancy word for everywhere.  It was in the street medians, parks, store fronts, and in front of most homes, but for good reason.  The soft lavender blooms are eye-catching.  The cloud of colorful flowers above the finely textured aromatic foliage is a wonderful combination.  Did I mention that Russian Sage is tough?  It shines in any full to part sun location.  It can survive drought conditions, but appreciates weekly watering.  They are best displayed in mass plantings or with native grasses.

Russian Sage-Photo Courtesy of Walters Gardens, Inc.

Photo courtesy of Walters Gardens

 


Button Blazing Star-Liatris aspera

Blazing stars have put on quite a show this year and button blazing star is no exception.  It is in full bloom right now in 100 degree heat and loving it.  The entire plant matures to 3′ in height, but the real show is the purple button flowers that develop along the stem.  It is happiest in medium to dry soil conditions and will become unhappy with too much moisture.  Pollinators flock to it, including butterflies, hummingbirds, and bees.  Plant them in mass, 8-12 inches apart for the ultimate display.  I like to integrate several grasses like Little Bluestem or switch grass to give interest later in the season.

Liatris aspera

Photo taken at Dyck Arboretum of the Plains

 


Hummingbird Mint- Agastache ‘Blue Boa’

This plant has been one of my biggest surprises over the last several years.  It is almost always in bloom.  It loves the heat and humidity.  The deep violet-blue blooms lure many different pollinators and ‘Blue boa’ requires very little care once established in a medium to dry location.  If you want to help the pollinators, try a few in your landscape. You will be surprised by them, too.

Agastache Blue Boa-Photo Courtesy of Terra Nova Nurseries

Photo courtesy of Terra Nova Nurseries

 


Aromatic Aster-Aster oblongifolius ‘October Skies’

We have been growing this great form of our native aromatic aster for several years.  It is not rambunctious in the landscape.  In fact, it develops into a nice bush that is covered with glowing lavender flowers.  When the whole plant is in bloom it looks like a mum on steroids.  Flowers begin to open in late September and last into October.  During the warm days of autumn, pollinators congregate on these beauties, seeking to collect the last pollen of the season.  We have used them in borders and native groupings with ornamental grasses.

Aster October Skies

Photo taken at Dyck Arboretum of the Plains

 

Notice the theme?  They all have lavender blooms.  These are a few plants that are doing well in the arboretum.  What plants have you had success with this year?

Five Grasses You Should Be Using In Your Landscape

I am always in search of the tough, resilient plants that stand out in any challenging landscape.  Certainly, ornamental grasses fit into this category.

They are increasing in popularity because of their texture, form/structure and interesting seed heads.  Another reason their popularity continues to grow is that they require minimal care and provide year-round interest.

Ornamental grasses are a diverse group of perennials that expand the plant palette of any design, but many of them get too tall for a typical landscape application.

This week, I wanted to make note of some of the dwarf grasses in our gardens.  As you know, fall is the best time of the year for most grasses.  They are showing off their attractive plumage and the beautiful fall colors are beginning to develop.  These five grasses have worked for me, and can be found next week at our Fall FloraKansas Plant Sale:

 


Blue Grama-Bouteloua gracillis ‘Blonde Ambition’         

This Blue Grama Grass is apparently on steroids.  I cannot believe how vigorously it grew this year, ultimately reaching two feet tall. This taller form has bright blue-green leaves that are topped by a host of eyelash-like golden yellow flowers.  They wave in the wind and ambitiously last from summer into the fall and winter months.  I used it along a walkway but it is so attractive that it could stand on its own providing many months of ornamental interest.   This beautiful grass was discovered by David Salmon of High Country Gardens.

Blue Grama Blonde Ambition

 


Little Bluestem-Schizachyrium scoparium ‘Carousel’

At home in a formal planting or prairie garden, you don’t have to sacrifice anything by planting this Little Bluestem.  Carousel remains stiffly upright even through the winter.  The gentlest breeze puts the plant in motion.  The blue-green leaves are highlighted by pink that gradually turn to rich copper, pink, and mahogany tones in the fall.  It truly has a carousel of color.  It provides a beautiful backdrop to perennials like coneflowers or black-eyed susans. This graceful, low maintenance Little Bluestem will provide a form that can be used in any sunny landscape.   Other garden-worthy varieties of Little Bluestem are ‘Standing Ovation’, ‘Blaze’ and ‘Blue Heaven’

Carousel

 


Prairie Dropseed-Sporobolus heterolepis

At one time, this was the top selling native grass in the country.  To see a mass planting in full bloom, you can understand why it is so popular.  The narrow leaves form a perfect fountain of green.  In late summer, the fragrant airy seed heads develop.  Some liken the fragrance of the blooms to buttered popcorn.   With this plant, you can get your theater popcorn fix without all the calories.  It requires almost no maintenance once established.  Fall color is burnt orange and rivals Little Bluestem in mass plantings.  A shorter form of Prairie Dropseed worth trying is the variety ‘Tara’.

Prairie Dropseed

 


Switchgrass-Panicum virgatum ‘Cheyenne Sky’

WOW! This grass is spectacular this year.  They are totally saturated in reds and purples.  Most switchgrass varieties get four to five feet tall, but not ‘Cheyenne Sky’.  It forms an upright three foot clump.  The vibrant red color hues begin to develop in early summer followed by reddish flower clusters in August and September.  The leaves rustle with the slightest breeze and sway in the wind adding movement to the garden.  I use it in containers, groupings or as a specimen plant by itself.  It is a very versatile and beautiful grass.

Cheyenne Sky

 


Fountain Grass-Pennisetum ‘Little Bunny’

We have been thrilled with this miniature fountain grass.  It puts on a show during the summer when the tiny cream seed heads pop up over the cascading green leaves.  The seed heads resemble little bunny tails, hence the name.  We have found it to be a reliable performer in the perennial borders and  when planted in mass.  If you have limited with space, then this grass would be a great choice.

Little Bunny

Questions: Which of these grasses have you tried in your landscape?  What steps do you need to take to integrate more grasses into your garden?