By Teri Silver
When spring becomes summer, untreated grass becomes a haven for weeds. There’s really no getting around it unless you’re diligent with treatments. Cool-season and warm-season grasses are susceptible, especially in the dry summer heat. When planning home and yard maintenance projects, it’s helpful to know what to look for and how to remedy the problem.
Identifying weeds in the yard starts with the grass itself. Cool-season grass grows in areas where average temperatures are between 60 and 75 degrees Fahrenheit in the spring, summer, and fall. Cool-season varieties – Kentucky bluegrass, fescues, and perennial ryegrass are suitable for properties within sections 1 to 7 of the U.S.D.A. Plant Hardiness Zones. Turf for warmer regions of the United States, in zones 8 to 13. They include Bahiagrass, Bermudagrass, centipedegrass; St. Augustine; and Zoysiagrass. These tropical varieties grow in average temperatures between 75 and 90 degrees F.
Some weeds are easier to spot than others that tend to blend into the lawn. They include:
Pre-emergent and post-emergent herbicides are specifically formulated for particular weeds.
You should apply pre-emergent products before the seeds begin to germinate. They typically control annual grasses (like crabgrass) and go directly into the soil. You need to water right after applying pre-emergent products, and you shouldn’t overseed those areas.
Post-emergent weed-killers control weeds when foliage is directly targeted by the chemicals. Herbicides must be soaked into the plants for chemicals to spread down to root systems. When using post-emergents, do not water the grass. Doing so will wash the chemicals off the weed’s leaves. Wait until there’s no rain in the forecast and another few days before you mow. The best time to treat for ground cover weeds is in the fall and spring. Additionally, consider weed and feed’ options, which combine post-emergent weed killer with grass fertilizer.
Your best defense against all weeds is a lush, green well-mowed lawn. Weeds often look for bare or weak spots. When you do spot a weed, pull it from the roots and dispose of it before it has a chance to spread or sprout seeds.
Teri Silver is a journalist and outdoor enthusiast who grows her own vegetables and spends her weekends mowing and weeding her 5-acre lawn.
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