June Tips for the Garden 2009

Let’s talk PERENNIALS! June is National Perennial Gardening Month. The 2009 Perennial Plant Symposium will be held in St Louis this year on July 19-21. They are expecting hundreds of visitors to tour gardens and garden centers around the region to see what we have to offer in the Midwest. That is pretty exciting! Perennials are plants that grow and flower every year, and only need to be planted once! They die back to the ground in the fall, but the roots remain alive and will produce new foliage in the Spring. A wide range of sizes, flower colors and blooming times are available to fit any size garden. Most perennials are considered low maintenance and just need some general care to keep them happy and healthy.

It is important to choose plants that are appropriate to your garden site. You need to know whether it is a sun or shade garden. Full sun plants can be in areas with six or more hours of sunlight every day, four to six hours is partly sunny, and four hours or less is a shade garden. Remove any grass or weeds from the area you wish to plant. Good drainage is essential for successful plants. Amend the soil with Missouri Botanical Garden Compost, also known as Black Gold, now locally available. This will help improve drainage and aeration. Prepare the bed to a depth of 18” to allow for maximum root development. Fertilizer can be mixed into the soil prior to planting.

When planting, dig the hole as deep and twice as wide as the container it is currently growing in. Loosen the root ball and tease the roots so they will grow outward. The plant should be set at the same depth as they were growing in the container. After filling the hole back in with soil/compost mixture, water thoroughly and apply Fertilome Root Stimulator for plant success. Read the plant tags for spacing recommendations because many will spread more than their current size. Don’t be afraid to mix textures.

Perennials should receive 1-2” of water each week to develop a deep root system. A soaker hose works well for this purpose and saves water usage. Fertilize in Early Spring when new growth begins. During the growing season, fertilize once a month until the end of July. This will help the plants harden off for winter. Mulch should be applied after planting to help hold in moisture and reduce weeds. Apply 2” over the soil, leaving 2-3” of space around the base of the plant. Do not smother the crowns of shallow rooted plants. Additional mulch applied in winter is also recommended, especially for new plantings.

The art of deadheading is removing the faded, spent flowers on a plant. It will help lengthen the bloom season of many plants as well as improves the appearance of the plant. Some perennials with attractive seedpods such as Rudbeckia, Sedum, and Ornamental Grasses can be left alone. Once the initial display of flowering has ended, cut back the entire plant by two-thirds. This will help promote additional blooms.

I hope this information gives you the desire to plant some perennial color and texture in your yard! There has been a “Perennial of the Year” named by the Perennial Plant Association since 1991. These varieties are tried and true plants. You may check out the list at http://www.perennialplant.org/.

Now in closing, let’s discuss several other tips for the month of June. Soaker hoses and Raindrip irrigation systems make the most efficient use of water during dry times. Check out the systems available. Continue spraying roses with fungicide to prevent black spot. Mow lawns frequently enough so you don’t have to remove more than 1/3 of the total height of grass per mowing. There is no need to remove grass clippings from the lawn unless they are excessive. Prune flowering shrubs after they have bloomed. Hand prune or shear evergreens now. Watch for bagworms AND JAPANESE BEETLES. Milky Spore, Grub killer, and Japanese Beetle traps are available to eradicate Japanese Beetles. For bagworms, use insecticide with the pest listed on the label or hand pick them if the numbers are light.

Plant pumpkin seeds now to have Jack-o-lanterns for Halloween. Stop harvesting asparagus when the spears become thin. Repeat plantings of corn and beans to extend the harvest season. As soon as cucumber and squash vines start to “run,” begin spray treatments of Permethrin to control cucumber beetles and squash vine borers.

Enjoy your harvest………………………….see you in the garden.
Sandi Hillermann McDonald

May Tips for the Garden 2009

Gardeners, start your containers!! Spring has sprung! The weather is beginning to turn warmer and the sun is beginning to hang around a little more each day. Now is the time to plant warm season annuals and vegetables. I want to focus on veggie garden containers this month. Even small space gardeners can grow enough nutritious produce to prepare a few meals, supplement your diet, and save some bucks. With a little planning and attention, container gardens can produce like mini farms.

Almost any vessel can be used as a container, but it must have drainage holes that allow water to freely flow through the pot. Most veggies only need 8” of soil depth. Trays and smaller containers work fine for lettuce, radishes, spinach, and peppers. Root crops like carrots and onions, and large plants like most tomatoes and squash, require containers larger than 16 inches in diameter. Generally as a rule, bigger is better for root growth and overall vigor.

When growing veggies in containers, packaged potting mixes are typically the best choice to use for a planting medium. Using garden soil in containers is never ideal. Packaged potting mixes are lightweight, moisture retentive, and well aerated. In addition, they do not harbor any fungi, bacteria, insects, or weed seeds that would cause problems later.


Sunlight, not space, is probably the biggest limiting factor in urban environments. Without at least six hours of sun a day, it will be tough to grow quality vegetables. Crops need a lot of solar energy to make nutritious fruits, seeds, and leaves. Southern exposure is best, but six hours from any direction should be sufficient. To avoid leaning or uneven ground, rotate the containers weekly. Use wire cages or other sturdy supports to protect large plants like tomatoes, beans, peas, and squash.

Regular watering is crucial when you grow in containers because there is a limited soil mass for storing water. During the peak of summer heat, gardeners may need to water daily to keep plants growing at full potential. A drip irrigation system allows you to water automatically, and with a timer, you can even water containers while you’re away. However, the best option for vacation watering is always a reliable neighbor. Vegetables grown in containers also need regular fertilizing. Follow the label instructions, and make sure the container is well drained or plants may suffer from high salt levels due to fertilizer buildup. Some gardeners combine the two tasks and simply water with a quarter-length fertilizer solution once a week.

If plants don’t appear vigorous and healthy, check them closely because disease and pest infestations can quickly get out of hand. If caught early, most are easy to treat. Check the undersides of leaves for insects. Many of them can be picked off or sprayed with a strong stream of water. Some pests require other treatments. Natural insecticides are very popular with home gardeners. Always read insecticide labels to make sure the product is compatible with food crops, and follow the directions carefully.

When looking for plants, look for vigorous young seedlings with bushy growth. Check to make sure each seedling is securely anchored in the six-pack or pot, which implies a well-established root system. Dip the seedling in a bucket of water to moisten the root ball, tease out any circling roots, and plant it at the same depth it was previously growing. (Tomatoes are an exception to the planting depth rule because they can be planted with the bare stem several inches below the ground, and roots will form along the stem.)

Some crops like lettuce, beets, and carrots, are best grown from seed. Simply follow the instructions on the packet. Be sure to thin sprouts to the recommended spacing. Thinning is a ruthless task, but fortunately most veggie sprouts can be used in salads and other dishes for a spring treat.

If you have space to do a small raised bed garden in place of containers, check out http://www.squarefootgardening.com/ for a complete listing and schedule to produce a plentiful harvest for a family of four. Dig in and see how great and beneficial veggie gardening is!

Enjoy the season,
Sandi Hillermann McDonald