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Irrigation, Mulches, Fertilizers & Weed Control

Mississippi summers are typically dry for weeks. Therefore, be prepared to water annual plantings as needed. To promote deep root growth, water thoroughly and deeply, then let soils get nearly dry before soaking again. Gently water annuals, using the fine spray setting of an adjustable nozzle or a breaker specially designed for watering. Soaker or sprinkler hoses are more convenient than hand watering because they provide a gentle flow of water that seeps into the soil. Trickle or drip irrigation kits conserve water by putting it only at the base of plants, a little at a time, and are best used frequently to keep soil moist. Soakers and drip systems also help keep foliage dry, which can reduce the spread of leaf diseases.

Decorative mulches such as pine straw, shredded bark, composted leaves, or other porous materials that allow air and water exchange help to conserve water and keep the soil cooler. Mulches also prevent many weed seeds from sprouting, but they can hinder reseeding annuals for the same reason. Soaker hoses can be hidden beneath the mulch.

Annual plants often require extra doses of fertilizer during the growing season. Whether a granular or a water-soluble fertilizer is used, follow label directions for use. Water-soluble fertilizers give fast, but temporary, effects. Slow-release fertilizers are the most expensive; however, they provide the appropriate amount of fertilizer to the plants throughout the growing season with little effort and waste, which makes them more economical and environmentally safe. Most annuals benefit from an all-purpose fertilizer having an even or nearly even balance between nitrogen, phosphorous, and potash, as indicated by the three numbers on the container. Flowering plants may perform better when you use a fertilizer with a higher middle number (more phosphorous); green or colorful foliage plants such as amaranth, caladium, and basil benefit from higher nitrogen (first number). Remember that fertilizers, like salt, go a long way; a little is better than too much.

The ideal soil pH is between 6.0 and 7.5 for most flower species. A soil test will indicate the need for lime, if any, and the amount for your particular soil type. For soil testing information, contact your county Extension office or use an inexpensive test kit available from a garden center or mail order catalog. Agricultural lime often lasts in Mississippi soils for three or more years; for this reason, it is best to not add lime unless a soil test indicates a need and quantity.

Few things can dampen enthusiasm faster than weeds. To reduce the need for hand-pulling or chopping weeds, there are herbicides that prevent weed seed germination and others that eliminate existing weeds on contact. Some may be used to control grasses without harming flowers. There are precautions and guidelines on the uses of herbicides, making none completely foolproof. Consult with your county Extension agent or local garden center on the selection and use of weed control chemicals, and carefully follow label directions. Mulches shade weed seeds and prevent their germination, thereby eliminating or reducing the need for hand or chemical weed control.

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News

A butterfly rests on a cluster of white blooms.
Filed Under: Flower Gardens August 15, 2022

As the time nears for summer to turn to fall and temperatures drop, I get excited thinking about the changes this will bring to the landscape. Depending on where you garden in Mississippi, September, October and November can be filled with some of the brightest colors of the year.

Ruffled yellow flowers bloom on a branch.
Filed Under: Flower Gardens August 8, 2022

After last week’s discussion of growing sunflowers in the fall season, I was inspired to consider what is involved in growing yellow flowers all year in most Mississippi gardens and landscapes. Obviously, different plants need to be selected for the different seasons, so I’ve put together a list of yellow flowers that you can enjoy through the year.

A field is covered with blooming sunflowers.
Filed Under: Flower Gardens August 2, 2022

I think sunflowers fall into the category of sunny, summer royalty. One of the most striking sunflower sights I have ever seen was while driving through North and South Dakota on the way to Sturgis and Bike Week. There were miles and miles -- acres and acres -- of yellow sunflowers blooming for as far as the eye could see.

Dirt covers three colors of freshly picked carrots.
Filed Under: Flower Gardens, Vegetable Gardens July 25, 2022

Simply walking out the front door each day, we’re reminded that it is a blistering hot summer season. But believe it or not, now is the time to start planning and getting ready for the fall vegetable garden. We’re only 36 days from the meteorological start of the fall gardening season.

Small, red tomatoes hang in a cluster on a vine.
Filed Under: Flower Gardens July 18, 2022

As the host of Southern Gardening, I promote primarily ornamental landscape and garden plants through newspaper articles, TV segments and social media posts. So I find it interesting that most of the questions I receive revolve around the vegetable garden.

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Portrait of Dr. Gary R. Bachman
Extension/Research Professor
Ornamental Horticulture Host of Southern Gardening