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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 bumblebee climbs on a single, pink-and-orange cluster of blooms.
Filed Under: Flower Gardens February 10, 2020

One of my favorite easy-care, flowering plants has to be lantana. This low-maintenance plant is highly tolerant of the hot, humid summers in our Mississippi gardens.

It’s no wonder that lantana has been selected as a Mississippi Medallion winner three times.

Small purple berries in clumps line branches with green leaves.
Filed Under: Flower Gardens February 3, 2020

Through February, I’m highlighting plants named 2020 Mississippi Medallion winners. Each of these winners is superbly adapted to our garden and landscape environment.

This week, I want to tell you about American beautyberry, a winner that is a native species found across the Southeast. It is known botanically as Callicarpa americana.

Maroon veins stand out on a sea of chartreuse leaves.
Filed Under: Flower Gardens January 27, 2020

A couple of weeks ago, I had the privilege of introducing the 2020 Mississippi Medallion Winners at the Gulf States Hort Expo in Mobile, Alabama. This is a special group of selections, as the Mississippi Medallion program is celebrating its 25th anniversary in 2020.

The plants selected for 2020 include Colorblaze coleus, beautyberry, Luscious Series lantana and Garden Gem tomato.

A person with yellow gloves on planting a shrub.
Filed Under: Lawn and Garden, Flower Gardens, Landscape Management, Vegetable Gardens January 27, 2020

It may be chilly outside, but don’t let that deter you from going outside and working in your garden and landscape. Grab a jacket and your gardening tools, there is plenty to be done during February! 

Different varieties of pink and white dianthus flowers.
Filed Under: Flower Gardens January 17, 2020

I don’t think you can go wrong with some dianthus in your landscape in 2020.

I love the flower colors that include pink, red, lavenders, white, and bicolors. The foliage of these plants ranges from being grass-like to broader strap-like linear leaves. Plus, the foliage provides contrast with colors ranging from bright green to steely blue-gray.

There are some great selections that will do a fantastic job in our Mississippi gardens and landscapes especially in the cooler months of the year.

Watch

Transplanting Shrubs
Southern Gardening

Transplanting Shrubs

Sunday, January 19, 2020 - 7:00am
Bromeliad Care
Southern Gardening

Bromeliad Care

Sunday, January 12, 2020 - 7:00am
Crape Murder
Southern Gardening

Crape Murder

Sunday, January 5, 2020 - 7:00am
Shishi Gashira
Southern Gardening

Shishi Gashira

Sunday, December 29, 2019 (All day)
Cool Season Combo Containers
Southern Gardening

Cool Season Combo Containers

Sunday, December 22, 2019 - 7:00am

Listen

Wednesday, February 19, 2020 - 7:00am
Tuesday, February 18, 2020 - 7:00am
Monday, February 17, 2020 - 7:00am
Friday, February 14, 2020 - 7:00am
Thursday, February 13, 2020 - 7:00am

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Your Extension Experts

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