When should I aerate?
Early spring or fall.
How many holes are needed?
In order to ensure thorough aeration, experts recommend at least nine holes per square foot of lawn and as many as 16 per square foot in some types of clay or other densely compacted soil. This may require going over your yard several times. Aeration holes should be two to three inches deep for maximum value.
What about fertilizing?
An application of fertilizer, along with heavy watering just after aeration, will greatly stimulate root growth. Deep watering every two or three days, for a few weeks after aerating, will cause the roots to grow deeper for increased strength during dry times.
Can I seed at the same time?
Absolutely, and it is highly recommended! Combining aeration with seeding is an excellent idea. Aeration loosens up the soil, giving new plant roots "room to grow." This applies to over-seeding existing turf or planting new grass.
What about weeds?
Studies show that pre-emergent applications are not affected by core aeration. Weed seeds on top of the pre-emergent barrier will not grow down through the barrier, nor will weeds grow "sideways" toward the aeration holes. Feel free to aer¬ate before, during, or after treating for annual weeds (such as crabgrass).
What should I expect?
Keep in mind, lawn care is a long-term process requiring regular maintenance. While aeration can provide dramatic results, don't expect miracles from a single aeration. The benefits of improved fertilizer absorption, better rooting, and thatch breakdown will result in a greener, healthier lawn over time.
Lawn aeration is generally recognized as the best way to improve air/gas exchange and water/nutrient intake. Some aeration occurs naturally, but due to soil compaction or other soil conditions, lawns rarely thrive without some means of mechanical aeration.
In addition to compaction, thatch build-up (more than 1/2 inch) can be especially damaging to lawns. It acts as a barrier, preventing water and nutrients from getting into the soil.
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