Table of Contents
Spring Lawn Herbicide and Fertilizer Applications
Article by: Beverly Cobb, ANR Agent Camden County
When caring for a lawn, timing is everything. When applying preemergent herbicide treatments and fertilizer, doing so too early or too late reduces effectiveness and causes lasting damage. Knowing when and when not to apply each can significantly change the lawn’s health and weed management throughout the season.
Understanding the species of turf in the lawn will help determine what should be used and what can cause damage to the grass. Improper applications of herbicides and fertilizers can cause more issues that can take time and costly management decisions to solve.
Preemergents
Preemergent herbicides are a key tool for managing summer annual weeds when applied at the right time. They should be applied before weed seeds start to germinate to be effective. Once weeds are visible, it is too late to apply a preemergent herbicide. Soil temperatures should consistently be above 65 degrees, generally from late February to mid-March here in Camden.
When applied properly to established turfgrasses at least 1 year old, preemergent herbicides can provide season-long management. If applied to a healthy, vigorous lawn, the impact of a preemergent is usually not serious; if the lawn has been struggling, a spring application of preemergent could have a severe effect. Preemergent herbicides should not be applied after seeding, sprigging, or sodding lawns, as they will prevent the turfgrass from establishing.
To reduce damage resulting from improper herbicide use, be sure to read and follow the product label. Ensure that the product is labeled for the turfgrass species in your lawn and apply the herbicide at the specified rate and method.
Applying Fertilizer
Initial fertilizer applications should be timed to benefit emerging turf grass rather than remaining weeds. The application of fertilizer too early, before the grass roots are active, increases the possibility of nitrate loss from the root zone.
Having the lawn soil tested before applying fertilizer will help when choosing what fertilizer to apply, the correct nutrient ratio, and whether any soil amendments are needed. Taking soil tests every few years is important because the nutrient levels can change as the turfgrass grows. Testing soil supports healthy lawn maintenance and plant vigor.
Learn More
For more information about annual lawn management, view UGA Extension warm season turfgrass species webpage, where lawn care calendars for common turfgrass species are also available. For more information about soil tests, view Camden county extension webpage and select the testing services tab under Agriculture & Natural Resources. If you would like a poster version, stop by the Camden County Extension office to pick one up.
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