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When Should You Aerate Bermuda Grass?

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When Should You Aerate Bermuda Grass?

A guide to when to aerate Bermuda grass and the basics of why it may need aeration and what tools to use.

Bermuda grass (Cynodon spp.) is a warm-season grass, meaning that it greens up in spring, flourishes in summer and finally loses its color, going dormant in autumn. Bermuda grass grows in U.S. Department of Agriculture plant hardiness zones 7 through 10. When to aerate depends on the condition of the grass and soil. Timing depends on when it turns green in your area.
When Aeration May Be Necessary
Compacted soil and the buildup of thatch, a layer of dead grass at the bottom of Bermuda grass, are the main reasons that Bermuda grass needs aeration.
Heavy clay soils compacts more easily than other soil types. Water that runs off Bermuda grass after irrigation and water pooling on the grass after rain are both signs of soil compaction. Highly compacted soils block the penetration of oxygen, reducing the population of earthworms and organisms needed to decompose thatch
Tip
If you poke the soil with a screwdriver and it goes in easily, it probably doesn’t need aerating. If it’s hard to jab the screwdriver into the soil, it may need aerating.
Timing Aeration
As long as Bermuda grass is not suffering from drought, you can aerate it any time during its spring to early autumn growing season, but the best timing varies. When Bermuda grass is turning green in early spring, its tender shoots and roots are using stored energy, so this is not a good time to aerate. If you only aerate your grass once a year, the best time is late spring or early summer when your lawn is completely green and the soil temperature is above 80 degrees Fahrenheit.
Aerate when the soil is moderately moist. Aerating wet soil is messy and leads to more compaction. If soil sticks to your shoes, delay aerating until the soil dries out.
Tools to Use
For small areas, you can use a hand aerifier that you push into the soil with your foot. For larger areas, rent a roller aerifier with hollow tines on a drum. As you roll the drum, the tines, usually about 6 inches apart, punch into the soil and remove cores of soil. A power aerator has a piston that drives hollow tines into the soil -- usually 2 inches apart -- and has the advantage of not tearing the grass.
If you aerate and remove cores of soil, you can leave them on the surface of the grass to deteriorate. You can also let them dry and then break them up by dragging weighted chain-mail fencing or carpet over them. You can get rid of them using a dethatch attachment on a rotary mower as well.

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