Partner Perennials

Posted on April 5, 2017 by Katie Schmidt

As the weather warms up and perennials begin to sprout I find myself in the gardening mood! Whether filling in gaps in an existing garden bed or planting up a new area, knowing which plants will look best together can be a sort of guessing game. But a fun one! When I start getting too many ideas about what plants to pair up, I put pencil to sketch pad and doodle my ideas into reality.

There are countless unique, easy combinations for every situation that can incorporate natives, exotics and even our old garden favorites. Maybe you can use some of my recent sketches, maybe they will inspire you to draw up some of your own!

For the Shady Place

Try partnering bright colored blooms together and using leaf color that adds contrast. For example, using light greens behind darker greens can add depth and interest to an area that is only foliage. You can use striped hostas (Liberty, June Spirit, Brother Stephan) to liven up a dark area and use lowgrowing spreaders as ground cover between them (Ceratostigma plumbagnoides, Gallium odoratum) In my shade garden at home I already have some hostas planted, so I am thinking of filling in around them with some native Silene stellata (Starry Champion) and some non-native Epimedium rubrum (Barrenwort). Waldesteinia fragoides (Barren strawberry) might be the perfect ground cover to suppress weeds around it all. The purplish hue of the epimedium blooms will work well with the yellow of false strawberry since they are complementary colors (situated opposite each other on the color wheel).

If you have a shady spot, try planting fillers between hostas to add interest and texture.

Epimedium rubrum By Salicyna (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons. Silene stellata at https://commons.wikimedia.org/wiki/File:Silene_stellata_flowers.jpg
Barren Strawberry by User:SB_Johnny (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], via Wikimedia Commons

Good pairings for part sun areas:

Solidago rigida (Rigid Goldenrod) + Anemone ‘Pink Kiss’ (Pink Snowdrops)
Heuchera ‘Fire Chief’ + Carex pennsylvannica (Pennsyvannia Sedge)
Asarum canadense (Wild Ginger) + Matteuchia struthiopteris (Ostrich Fern)

For the Hottest Hot Spot

https://commons.wikimedia.org/wiki/File%3AEryngium_planum_bgiu.jpg

What plants can partner together to beat the heat? A dry, hot spot is a perfect place for mixing native grasses and wildflowers that have evolved in the prairie sun. For a rock garden or sunny burm, try this combination of Eryngium yuccafolium (Rattlesnake Master) and Eryngium planum (‘Blue Glitter’ Globe Flower) that will complement each other’s whimsical, spherical blooms. Sporobolis heterolepis (Prairie Dropseed) and Delosperma (‘Firespinner’ Creeping Ice Plant) will fill in around the base of the taller plants. Not only are the Eryngiums major pollinator magnets, they are also long lasting cut flowers! The bright orange-red blooms of the ice plant will warm up the cool hues of the eryngiums.

A mixture of grass, upright specimen plants and crawling ground cover will create a nice balance

Other suggestions for full sun pairings:

Achillea ‘Moonshine’ (Yellow Yarrow) + Callirhoe involucrata (Poppy Mallow)
Rudbeckia missouriensis (Black Eyed Susan) + Helenium ‘Salsa’ (Sneezeweed) + Sedum ‘Lidakense’

If You Need Some Height…

Perhaps growing along a fence or forming a border between yards, tall plants provide structure for the garden. A columnar grass species like Panicum ‘Northwind’ (Switchgrass) or Miscanthus (Silvergrass) can be the eyecatching backdrop for other perennials. They also provide support to tall flowers that might otherwise flop over when they reach their mature heights. Planting Veronicastrum ‘Lavender Towers’ (Culver’s Root) or Eupatorium maculatum (Joe Pye Weed) between tall, strong stemmed grasses can keep them upright in a stiff prairie wind. The sketch below shows a shorter variety of Joe Pye called ‘Baby Joe’ situated between some Miscanthus grass with Scabiosa (or, just as well suited, Knautia) growing wispily in front.

For an area that can use some height, install some Miscanthus grass for a big effect in fall.

Eupatorium (right) by Krzysztof Ziarnek, Kenraiz (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
Blue Scabiosa by By Xemenendura (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

Tall grass that will support tall flowers:

Andropogon gerardii (Big Bluestem) + Coreopsis tripteris (Tall Coreopsis)
Calamagrostis acutiflora (Karl Foerster Grass) + Salvia azurea ‘Grandiflora’

Partnering plants is the fun part of perennial gardening – let your imagination go wild! Use the color wheel to make the most of your pairings and pay close attention to foliage shape and texture to achieve a harmonious look. If you think some of the plants in this post will work well in your yard, come to our FloraKansas Plant Sale April 28th – May 1st! This is our largest fundraiser of the year, and your purchase makes educational programming and the management of Arboretum grounds possible.

A Garden-Worthy Perennial: Threadleaf Bluestar

Posted on March 25, 2015 by Scott Vogt

Amsonia hubrichtii, the threadleaf bluestar, is one of my favorite plants. It was not well known among gardeners until the Perennial Plant Association named it the 2011 Plant of the Year. The species was discovered in 1942 by Leslie Hubricht growing in the Ouachita Mountains in central Arkansas. The species was later named in her honor.

Each plant has ornamental qualities that make it stand out from other perennial wildflowers. In May and June, clusters of small powder blue, star-like flowers top the strong stems. The stems are encircled with soft, narrow leaves resembling pine needles, making each plant look like a small shrub with feathery texture and incredible fullness. I have found them to be extremely hardy, drought tolerant and very low maintenance.

The real show develops in September when the foliage turns a butter yellow fading to a golden brown by October. One specimen plant is spectacular in each season of the year, but a group of ten or more massed together and strategically located are quite stunning. Individual plants can reach up to 48 inches tall and 24-36 inches wide. They prefer full sun to partial shade and an average garden soil.

This summer I have only watered them 3 times, so they are tough. At the arboretum, they are planted along the east border paths. Amsonia hubrichtii is a dynamic perennial that deserves a place in your garden.

Other Amsonia are just as ornamental, but offer different textural elements and sizes for just about any sunny to partial shade landscape setting. They are Amsonia illustris, Amsonia ‘Blue Ice’, Amsonia cilliata and Amsonia rigida.

Find amsonia hubrichtii and other garden-worthy perennials on our Plant List 2015 and visit us at our FloraKansas Spring Plant Sale, April 24-27, 2015.

Five Elegant Perennials for the Summer Landscape

Posted on September 2, 2014 by Scott Vogt

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.

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.

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.

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.

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.

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?