Proper Time to Core Aerate Southern Lawns

Core aeration helps develop strong turf.

Core aeration reduces thatch build-up, improves water infiltration and loosens compacted soils. Cooperative Extension Service experts suggest aerating when the lawn is growing vigorously. This will differ with the type of turf grass in the lawn.

Cool Season Turf

Northern sections of the South have a mix of cool season and warm season grasses used in the area's lawns. Cool season grasses include Kentucky bluegrass, fescue and perennial rye. Aerate cool season lawns shortly after the turf starts growing rapidly in the spring and/or late in the fall when temperatures are cool again and the grass is vibrant and healthy.

Warm Season Turf

Warm season grasses such as zoysia, Bermuda and St. Augustine have their most active growth period in late spring through mid-summer, so should not be aerated in the fall before their dormancy. Because warm season grasses tolerate or even thrive in heat, aerating in the hottest part of the summer can stress the turf and cause loss of water through evaporation. Early summer is the best time to aerate warm season turf.

Conditions

Within these proper times for aeration, watching for ideal conditions will maximize its benefits. The lawn should be moist, but not muddy. A few days after a deep soaking rain is ideal (depending on the lawn's drainage characteristics). Avoid aerating during very hot weather, if possible.

References

• Virginia Cooperative Extension: Aerating Your Lawn
• University of Missouri Extension: Aerating Your Lawn