Freshen up ‘tired’ flower beds

Richard Bogren, Gill, Daniel J.

For Release On Or After 08/10/12

By Dan Gill
LSU AgCenter Horticulturist

Forlorn flower beds past their prime and overrun with weeds are an all-too-familiar sight in late summer landscapes. Our long growing season and abundance of insect and disease problems generally make it unreasonable to expect all bedding plants to hold up from the beginning of summer in early May until its end. Unfortunately, many gardeners give up with the attitude that it is too hot to plant anything now anyway, and allow their beds to remain unattractive eyesores in the landscape.

Well, I’m here to take away your excuses for those pitiful looking beds. The nurseries are still well-stocked with colorful, heat-tolerant bedding plants that will grow vigorously from now through late October or early November, when we will plant cool-season bedding plants. And you can work in the cooler times of the day when it’s not so hot.

To replant your beds, first remove the old plants and put them in your compost pile. Avoid putting in compost any weeds that have set seeds. Dig those out and throw them away. You could also spray the weeds with glyphosate (various brands) to kill them before removing them. This would be especially recommended if you are dealing with tough weeds, such as bermudagrass, torpedograss or dollarweed.

Next, spread over the bed a 1- to 2-inch layer of organic matter, such as compost, bagged or aged manure, landscape soil conditioner, grass clippings or peat moss. Sprinkle a light application of any general-purpose fertilizer (following label directions) over the organic matter, and then thoroughly incorporate everything into the soil. Rake it smooth, and the bed is ready for planting. Try to do this work early in the morning or late in the afternoon when it is cooler, and drink plenty of fluids. Heat is no reason not to refurbish your flower beds, but you should still be careful when working outside while the temperatures are high.

When planting late in the growing season, choose well-established plants in 4-inch or larger pots. Make sure the plants you purchase are healthy and vigorous and have been properly cared for. Avoid plants that look wilted or leggy, have poor color or show signs of insect or disease problems. This is not the time of year to nurse struggling plants back to health. Start off with the highest-quality plants you can find.

Gardeners often rip or pull apart the roots of root-bound bedding plants slightly when planting them into the ground. This encourages the roots to grow into the surrounding soil and helps the plant get established. Do not do this when planting this time of year. Plants’ roots must absorb water rapidly to supply their needs when temperatures are hot, and transplants will not be able to tolerate much damage to their roots now.

Be careful to plant the bedding plants at the proper depth. The top of the root ball should be level with the soil of the bed. Planting transplants too deep makes them more susceptible to root rot or crown rot. The fungal organisms that cause these diseases are very active in the moist, hot weather of late summer, so make sure plants are not planted deeper than recommended.

When planting is finished, mulch with an inch or two of your favorite mulch and water the bed thoroughly. Watering is the trickiest part of planting this time of year. You may need to water the bed fairly frequently until the plants send roots out into the surrounding soil. Watch the plants carefully for wilting, and water when needed.

You have lots of choices for planting now. For sunny beds or containers, choose periwinkle, melampodium, blue daze, purslane, portulaca, pentas, torenia, perennial verbena, salvias, sun-tolerant coleus, lantana, zinnia, marigold, abelmoschus, globe amaranth, cosmos, balsam and celosia. For shady and partly shady beds and containers, choose impatiens, begonias and coleus. I’m sure you are likely to see other great choices available as well.

If you still intend to add tropical plants to your landscape, do it now so they will have time to get established before fall. Tropicals love the heat and are not stressed by it like so many other plants. Feel free to plant tropical hibiscus, cannas, gingers, elephant ears and other tropicals in the landscape now. Depending on where you live in the state, tropical plants may or may not reliably survive the winter. Keep this in mind when deciding how many and where to use them.

If you don’t feel up to replanting flower beds at this time, you can still improve the appearance of your landscape. Remove the old, unattractive plants, control the weeds and then apply a thick (at least 4-inch) layer of mulch over the area. An empty but neat and mulched bed is far more attractive than one full of weeds and dead flowers. The heavy mulch will keep the bed weed free and ready for you to prepare it and plant colorful, cool-season bedding plants in late October or November.

Rick Bogren

8/1/2012 7:07:16 PM
Rate This Article:

Have a question or comment about the information on this page?

Innovate . Educate . Improve Lives

The LSU AgCenter and the LSU College of Agriculture