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? 

 

Denver Botanical Gardens Trip

On a recent trip to the Rocky Mountains, I visited the Denver Botanical Gardens. My family rolls their eyes because we always visit some garden while on vacation. They usually have a good time once they are there but their short attention span makes me hustle through the gardens. Anyway, I noticed some interesting native plant displays that I want to try at the arboretum.

Denver Botanical GardensUnder some cottonwood trees were strategically placed shorter native plants. Essentially, they were mimicking a savanna landscape which is the transition zone between open prairie and forest.

The plantings were diverse with grasses and perennials. One of the many things that caught my eyes was how the plants were grouped. It made such a visual impact. Blooming perennials popped while the grasses offered texture and soft forms that blended the planting together. A small trail weaved its way through the entire landscape allowing visitors to get up close to the plants.

The grasses they used were blue grama, little bluestem, side oats, and prairie dropseed. The wildflowers included purple poppy mallow, four o’ clocks, columnar coneflower, penstemons, coneflowers, indigos, asters, blazing stars and goldenrods.
This display is totally scalable. By grouping at least five plants of a particular species together, they stood out in the garden. The grasses were used to line the path and edges but also were used as a backdrop to highlight the blooms and seed heads of the wildflowers. Grouping these individual species together makes it easier to weed, water and maintain.

We have been experimenting with this group approach at the arboretum with great success. A limited palette of wildflowers that bloom at different times of the year combined with grasses in artistic ways can have a tremendous visual impact.

Try spring bloomers next to those summer or fall blooming perennials. A little forethought before planting, matching the plants with your site, grouping species together, properly planting and establishing will go a long way to creating the effect you want in your landscape. I have found with natives that “less is more”.

What plants or landscapes have you seen in summer travels that you would like to try?