Monthly Archives: July 2023

Summer Garden Checklist

Posted on by Scott Vogt

Kansas summers can discourage even the hardiest gardeners. However, taking time to manage your garden now will help your garden later. Here’s my Summer Garden Checklist for the Kansas gardener.

Control Warm Season Weeds

Summer brings with it a new set of weeds to control. Hot weather germinates summer annuals like crabgrass, foxtail. Nutsedge and other weeds invade your lawn and landscape as well. Manage weeds using nonchemical methods such as cultivation, hand weeding, or mowing; use toxic chemicals as a last resort. 

Mowing regularly and occasionally edging along sidewalks and walkways is needed to ensure your lawn is not overrun with weeds. In a landscaped bed, hand pull any of these weeds, especially if they have seed heads.  It is so important to not let these weeds go to seed. Stay vigilant even though the summer heat tries to squash your enthusiasm. A little extra effort now will make your garden better this fall and into next year. 

Crabgrass in tree mulch ring controlled with roundup: one treatment should clean up the mulched area and keep it weed free the rest of the season.

Be Water Wise

To reduce evaporation, water when temperatures are cooler and air is still, usually in the early morning. Water deeply to moisten the root zone, but infrequently. About an inch of water each week is a good rule of thumb!  If you have invested in container plants, they will need daily watering, as soil in pots can dry out quickly and damage plant roots on hot summer days.  Each of our gardens have indicator plants that show stress first, let these plants be your guide as when to water.  For new planting started this spring, water when the top one to two inches of soil is dry.  Remember it takes three to five years for sustaining roots systems to develop for most native plants.  Supplemental watering is necessary to encourage growth and root development in these young plants. 

We use pressure compensating 1/2 inch soaker hoses to efficiently water trees, shrubs and a few flower beds. Each emitter puts out 1 gallon of water per hour.

Prepare for seeding

If you are wanting to establish native prairie plants from seed, now is a great time to prepare your area.  Mow your area short (1-2 inches). Control perennial weeds such as bindweed or Bermuda grass by carefully spraying the area with Roundup. It will take several applications to get these problematic weeds under control. If you can see soil, tillage is not necessary. If you can’t see soil, till lightly to expose some bare soil. Remember, each time you till, you bring up more weed seeds, so tread lightly. 

Measure your area and order a seed mixture that matches your site. A good seed mix ratio of wildflower to grass is 70% wildflowers to 30% grasses. Grasses tend to dominate over time, so this ratio will give the wildflowers a good start. We typically spread seed in November and December after the soil temperature has dropped enough to discourage germination. The natural freeze/thaw of the ground will work the seeds down into the soil to the proper depth for germination next spring. 

This is the seed mix we established along our newly renovated path.
Sidewalk edge planting: We mixed some sand with the seed mix to make it easier to distribute. We then let the natural freeze/thaw of the soil plant the seed for us through the winter. Germination occurred the following spring when soil temperatures rose above 60 degrees.

Trim

Now is a great time to trim back perennials that have become unruly. Perennial and grasses that are encroaching sidewalks, paths, and structures can be sheared back to size. If this is a problem every year, you may consider moving the taller plants to another spot. Plants can be divided next February or March before they start to actively grow. 

Low hanging branches from trees can also be pruned. It is getting late in the season to do much pruning on shrubs. New growth may not have enough time to get hardened off before cooler/colder weather.  If a branch or shoot is in the way, then prune it, but prune sooner rather than later. If you can wait until the shrub goes dormant this fall, then wait. 

As a general rule, early spring flowering shrubs such as forsythia, lilac and spirea should be pruned right after they are done blooming since they bloom on the previous year’s growth. Pruning right after blooming will allow the shrub to grow and develop a new set of buds for the next spring. 

A large compass plant that needs to be trimmed away from the path.

Finally, remember “WHY” you are gardening; creating habitat, conserving water, aesthetics, attracting pollinators, attracting birds and other wildlife or curb appeal. Let your “WHY” reinvigorate you to take care of a few extra tasks that will give your landscape a boost. Don’t sweat the small stuff and don’t forget to step back to enjoy what you are trying to create. If it is all work and no enjoyment, then what is the point.

Pale purple coneflower with a common buckeye butterfly. Fun to watch!

Know Your Garden Priorities and Purpose

Posted on by Katie Schmidt

Portions of this article can also be found in our Summer 2023 issue of the Prairie Window Newsletter.

Having a summer intern here at the Arboretum is a lot of fun. Not only because I have someone to commiserate with when the temperatures are unbearable, or someone to laugh with when everything goes wrong, but also because they always ask “why?”

The island garden here at the Arboretum features an evolving prairie planting from seed. We manage this area with annual prescribed burns.

Why did we cut it by hand instead of mowing? Why did we move those leaves or add mulch? Why do we maintain this garden different from the next one?

The answers to these questions almost always center around priorities and purpose. To curate an Arboretum, we manipulate our natural environment in different ways, with goals in mind for each specific area.

  • Is the purpose of this garden to attract butterflies? Then we don’t do any trimming during peak caterpillar hatching time.
  • Are we hoping to encourage lightning bugs to nest here? Don’t rake away the leaf litter.
  • Is the goal of this space to be symmetrical, patterned, or have a certain color palette? Then we weed more frequently and stick closely to the original design.

Knowing your priorities and the purpose of a space easily guides your decisions.

Plantings at our neighboring retirement community make use of drought tolerant plants with a more traditional approach to design.

Evolving Priorities

Traditional landscaping has one job: to look pretty. We started creating ornamental gardens at castles and estates to signify wealth and create beauty. Several hundred years of horticulture practice have passed with little change. These human-centric values still have a stronghold on the landscaping industry. The typical shrubs, trees, and perennials installed around a newly built home in an American suburb are purely ornamental, with no relation to wildlife, climate, or geographic region.

Their purpose? Purely aesthetic. And so all the future decisions must serve that goal. Heavy chemical use to maintain the green lawn? Yes, to preserve the aesthetic. Constant trimming and shaping of shrubs? Yes, to make them look different from their natural shape. Overuse of water to keep non-native species green in a climate they did not evolve in? Of course. This is not a sustainable option, and at its worst is an outdated practice steeped in vanity and classism. Thankfully these priorities are beginning to shift to a more sustainable model of landscaping.

Find Your Purpose

Everybody has to decide for themselves, and for each unique space, what the purpose and priorities are. If the goal is to teach students about native plants, then we should prioritize plant labels. spacing, and good organization in the garden. If the purpose is to increase habitat, then prioritize ecosystem function — high plant diversity, dense, layered planting, less structure.

This sign garden at Schowalter Villa’s Prairie Lakes begins to move in the direction of building plant communities by planting more densely, but still prioritizes traditional aesthetics over ecological function.

There is no “one way” to successfully use native plants. Some of our members are looking to decrease water usage, but keep their landscaping looking traditional and tidy. In this case, we might suggest using some cultivated varieties of natives that don’t spread or seed out much, but are very drought tolerant. For folks hoping to restore a prairie plot for conservation purposes, we would recommend straight species only and help them find an appropriate ratio of grasses and flower species native to their region, or even their county.

Liatris pycnostachya, or prairie blazing star

The plants chosen for each new project should be chosen with clear purpose in mind. A few years in, when you are adding new plants to the garden or making tough decisions, remembering your purpose and priorities will help keep you on track!

A big thanks to our grounds interns present and past, who have all asked excellent questions and contributed their talents to the Arboretum. You challenge us to always think critically about our priorities and purpose!