Callery Pear: Cut Them Down

Posted on March 28, 2024 by Scott Vogt

Originally posted on May 1, 2019

This is such an important topic and such a huge problem that we thought it is worth sharing again.

Several years ago, I noticed something disturbing was happening to our prairie reconstruction. Small little trees were popping up throughout the original prairie planting. I could not figure out where they were coming from, but they looked like pear tree saplings. It wasn’t until I saw a large white blooming Callery pear tree in the spring that it all came together.

Callery Pear

Although the flower clusters are beginning to fade, Callery pear’s white blooms are most obvious in the spring. We planted them for their explosion of spring blooms and nice fall color, but this ornamental tree has become highly invasive. It threatens native wildlife habitat and has become a nuisance for private and public landowners.

This once favorite tree was planted extensively throughout the U.S. The Callery pear – also referred to as Bradford pear – formed a nice pyramid to rounded shape. The vertical limbs made it a nice median and street tree as well, ultimately reaching 30 to 40 feet tall and 20 -30 feet in spread. This Chinese native was a harbinger of spring for decades with its prolific white blooms. An added bonus was its reddish-purple fall color.

Despite all those positives, these trees have become problematic. This non-native, flowering tree was assumed to be sterile, but it is not. It now cross-pollinates with other cultivars of Callery pear to produce hybrid offspring. The fruit is ingested by wildlife and birds that spread the seeds across the countryside and into your yards. It is aggressively displacing native vegetation, causing economic and environmental damage.

The message to property owners is to remove the trees now while you can easily identify them in bloom. We need to keep them from spreading to native areas. It doesn’t hurt my feelings to see them go, because they are a weak-wooded, thorny mess.

Native alternatives to Callery Pear:

Eastern Rudbud (Cercis canadensis)
Serviceberry (Amelanchier arborea or Amelanchier ‘Robin Hill’)
American Plum (Prunus americana)
Chokecherry (Prunus virginiana)
Blackhaw Viburnum (Viburnum prunifolium)
Rusty Blackhaw Viburnum (Viburnum rufidulum)

*Blackhaw Viburnum fruit and fall color*

We have cut down the culprit, but still have a bunch more saplings to remove this summer. There was one more larger tree that was cut down near the Visitor Center. We will continue to eradicate these unwanted invaders in our prairies. It will take time but I believe we can get the upper hand. I would encourage you to remove them in your landscape as well and replace them with native trees. Callery pear has no place in the landscape anymore.

*Image Source

Here is additional information on Callery pear trees from the Kansas Forest Service.

Benefits of Planting Perennials

Posted on March 20, 2024 by Scott Vogt

As gardeners, we have many choices of plants to introduce into our landscapes. From trees, shrubs, annuals, and perennials (including grasses), the options seem to be endless. Here at the Arboretum, we gravitate toward perennials for a number of reasons.

What is a perennial?

Unlike annuals that germinate, flower, set seed, and die all in one season, perennials are typically cold-hardy plants that will return again and again each spring. If situated in the right place in your landscapes, perennials will thrive, and will bloom either in spring, summer, or fall.

In my mind, the benefits of planting perennials in your home garden are as follows:

Incredible Root Systems

It often takes perennials several years to develop a sustaining root system after being transplanted from a pot. These root systems compared to many annuals is much more extensive and much deeper. During periods of drought, these deeper roots feed nutrients and moisture to the plant. The deeper roots of grass are credited with developing the deep layers of top soil found in many states that now support farm crops. These roots also control erosion, sequester carbon, and break up tough compacted soil.

Xeric Garden interpretive signage located on the Dyck Arboretum grounds. Artwork by Lorna Harder.

Diversity of Perennials to Establish in the Landscape

As I said earlier, there are so many different types and varieties of plants you can choose to establish in your display beds. A well-designed landscape with a variety of perennials will enhance the aesthetics and appeal of your property. With perennials that bloom at different seasons during the year and attractive grasses for fall and winter interest, you can create a diverse habitat for wildlife and pollinators, too. Keep in mind, the habitat you create is provides homes for insects and food for birds during the long, cold months of winter.

Prairie Window Project, August 2016. Photo by Brad Guhr.

Do perennials require less maintenance?

The key to success with perennials such as native wildflowers and grasses is putting the right plant in the right place in the right way. Perennials will NOT require less maintenance if you are trying to grow something in your landscape that has no business being there. Learn as much about the plants you want to use before you put them in the ground.

Perennials typically last several seasons. You don’t need to plant every single year like you do with annuals. By planting them once, you save money and time. You will need to clear last year’s growth in February or March and occasionally divide some clumps of perennial grasses as they expand over time. Perennials are a cost-effective and sustainable choice for landscaping.

*Panicum virgatum* ‘Northwind’ ready for spring.

Perennial plants can be the anchors to a landscape. While trees and shrubs provide the backdrop, perennials provide the elements of habitat that pollinators and other wildlife seek. These permanent pieces of your garden puzzle add beauty year after year. They can be combined to add continuous blooms and interest throughout each growing season. As perennials come in and out of bloom, a diverse collection of wildlife and pollinators will discover your landscape. This is ultimately the real benefit of a perennial garden.

A note about annuals

When I think about annuals in the landscape I don’t think about petunias. I choose annuals on their ability to provide nectar for pollinators. Nectar-rich annuals need to be drought tolerant and self-seed, too. See this article about a mostly annual garden.

The Edible Landscape

Posted on March 13, 2024 by Katie Schmidt

I am a big fan of a landscape that is functional as well as beautiful. Functionality might mean wildlife and pollinator attraction, water absorbing (rain garden) or water conserving (xeriscaping). But it can also mean incorporating human food plants into your perennial garden. This not only provides a healthy snack, but it encourages more interaction and participation. What is the point of a beautiful landscape if you aren’t out enjoying it?

Here is a small preview of some of the plants I discuss in my Native Plant School class, now available on our YouTube channel, all about landscaping with edible plants.

If this topic fires you up, stop by our gift shop to grab a copy of Kelly Kindscher’s Edible Wild Plants of the Prairie, a wonderful plant guide and exploration of ethnobotany on the Great Plains.

Elderberry (Sambucus canadensis)

A personal favorite of mine, Elderberry is as beautiful as it is nutritious. This plant will love a low spot in the yard where water tends to collect after rains, or an area with poor drainage. It can reach 8ft tall, putting on an impressive show in late spring when covered with massive white flower clusters. Berries ripen in July, a perfect time to spend the hot afternoons in the kitchen making jams and syrups. I make a cold remedy from them that has never let me down!

Pawpaw (Asimina triloba)

Persimmon (left) and PawPaw (right) both produce delicious fruit.

Everything about pawpaw seems tropical. Surely this fruit cannot be native to hot, dry Kansas…yet it is! It is an easy growing plant that can grow in full sun or partial shade and tolerates alkaline soil. To get a good fruit set you should plant more than one; though they have both male and female flowers on a single tree they are not self-fertile. The fruit is worth it! A custard-like texture with the flavor of bananas and mangos, it is perfect for pies and homemade ice cream.

Bee Balm (Monarda fistulosa)

*Monarda fistulosa flower, photographed by Brad Guhr*

If you are short on garden space and can’t add a shrub or tree, never fear. Monarda fistulosa is a wonderful edible perennial much smaller in stature than the previous options. About 3ft by 3ft when happy and mature, the leaves of this plant make excellent tea, with a flavor reminiscent of the bergamot oil used in Earl Grey. It has a long history of medicinal use by indigenous North Americans, for everything from upper respiratory problems to sore feet. The flowers are also edible and add a citrusy, spicy punch to salads.

From persimmon to chokeberry, we have so many native plants to choose from to diversify our diets and add beauty to our home landscapes. Thanks to thousands of years of culinary experimentation by the tribes and nations of North America we have a rich ethnobotanical tradition to learn from, an example of how to learn about, appreciate and interact with food and flora.

Gardens of France: American Cemetery at Normandy

Posted on March 6, 2024 by Katie Schmidt

When most people visit Normandy, they aren’t coming for the gardens. World War II historians flock here from all over the world to learn, explore, and pay tribute to the thousands who died here liberating France, and later freeing Europe. I personally love this area of France. It is my favorite by far, not only for its history, but for its beautiful, rugged landscape and friendly people. (And did I mention Normandy is the home of Camembert cheese?)

Of course, no trip to Normandy would be complete without a stop at the American Cemetery and Memorial. And though we aren’t always looking for great garden design, sometimes I can’t help but notice!

Design That Sets the Tone

This is a garden bed at the entrance to the Normandy American Cemetery and Memorial. It surprised me! Modern and understated, blending so well into the blocky, simplistic design of the memorial I almost walked right past it. It is made up of two species: likely Calamagrostis ‘Karl Forrester’ and Gaura lindheimeri, also known as white beeblossom.

This is a perfect example of matching the tone of the place to the design. At such a somber site, it might feel strange to have anything too colorful, jazzy, or disorganized. Instead, the grasses stand tall and stately, the Gaura wispy and low. The combination is perfect here, and when a bit of wind comes through them the planting has wonderful movement, and an ethereal quality. If a garden could whisper, this one would.

Ornamental Grasses

I spotted some familiar North American native grasses as I explored the well kept grounds. Through the memorial and onto the walkway to the cemetery, there is a border of switchgrass and fountaingrass. This combination was repeated multiple times along the way, softening the edges of the walkway – pink and pillowy, and always in motion thanks to the sea winds off the beach. The shrubs and trees behind created a three tiered border – making the walk feel a bit enclosed and sheltered from the otherwise open plain. After a tearful trip through the memorial hall and museum, it is a lovely feeling to be ushered along by this soft texture and gentle swaying movement, mimicking the waves on the beach.

Beauty in the Margins

St. Johns Wort in a simple parking lot planting at Normandy

St. Johns wort flower; yellow with five petals — St. Johns Wort in a simple parking lot planting at Normandy

In Normandy, even the parking lots are beautiful! I was impressed by the city planning. In the many small towns in the area around the beaches, there was an effort to create greenspace at every opportunity. Instead of bare, sparse plantings dominated by mulch we are used to seeing in parking lot islands, I encountered lush shrubs and thickly planted perennials. This is simply a choice of good design — choose plants that thrive under harsh conditions, plant thick enough that weeds cannot get through, and stick to mass plantings for the greatest effect.

Many white crosses in the lawn of Normandy American Cemetery, with fog in the background. — The American Cemetery was full of fog at our visit, making it extra special.

Lamberts rock, also known as Ray's Rock, a large rock siting on Omaha beach with black plaque commemorating the 1st Division medical staff that took shelter behind it to treat wounded soildiers. — The American Cemetery was full of fog at our visit, making it extra special.

Landscape vs Landscaping

The genius of the plantings in this region was that they seemed to blend right into the surrounding rural landscape. I can’t be sure whether the plants used were always native to the area or just well adapted ornamentals. But regardless, great care was taken to blend and match the natural shapes and textures of the seaside climate. Sometimes with grasses that bring to mind sandy hues and beach waves. Or even by using dense shrubs planted in layers, to mimic the famous hedgerows of the area. We can bring this lesson back home by taking careful note of the common shapes, colors, and textures in the natural landscape of our area. Using that, we can recreate those things in our residential landscaping on a smaller scale. It is an abstract way of designing, but the pay off is a garden that feels balanced and very much at home.