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.
The weather to start 2018 has certainly been crazy. We had more than a week of temperatures in the mid-20s (Freezemageddon) followed by a week of moderate, more normal January temperatures. Now, we’re freezing again this week.
What a crazy week we had to start off 2018 as “Freeze-mageddon” came blowing through with several nights of temperatures in the 20s or worse across the state.
I’ve been hearing and reading comments about the extreme cold we’re experiencing and how unusual it is. But to tell you the truth, these temperatures are not that unusual.
Mississippi gardeners who plan to incorporate more pollinator plants into their landscapes can consider native milkweed and begin gathering seed for indoor propagation.
As gardeners make New Year’s resolutions for their landscapes in 2018, I want to encourage all of them to resolve to correctly prune crape myrtles from this day forward.
In the current vernacular, severe pruning of crape myrtles is called “crape murder,” reflecting the seemingly random nature of the pruning cuts. To me, this type of pruning is very unattractive in the landscape.
For the last Southern Gardening column of 2017, I want to take a look back at some of my absolute favorite plants from my home landscape this past year.
I have been talking for several years about what fantastic garden performers Supertunias are. But my absolute favorite -- and it has been my favorite for several years -- is Supertunia Vista Bubblegum. This plant is so reliable it was chosen as a Mississippi Medallion winner in 2012.