May is prime time to dethatch and aerate lawns

May is an optimum time to aerate and dethatch your lawn. 

If your lawn is made up of perennial ryegrass or tall fescue, you likely don't have to worry about thatch, said Alec Kowalewski, a turfgrass expert for the Oregon State University Extension Service.

But if it's Kentucky bluegrass or creeping bentgrass, Kowalewski advised dethatching or aerating your lawn once or twice a year in the spring and fall.

Thatch is a layer of decaying roots and stems that build up between grass and the soil. If you can see thatch on the surface of the soil, you've likely got too much, he said.

"The best way to tell if your lawn needs dethatching is to take a shovel and dig out a little piece of soil and look at whether there is thatch layer accumulation," Kowalewski said.

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