When to Dethatch a Lawn in Maryland

Weeds sprouting along a concrete edge in a lawn area during warm season.

Most Maryland lawns never need dethatching. Measure the thatch first: under 0.5 inch, leave it alone. Above 0.75 inch, the timing depends on what you grow.

When to Aerate a Lawn in Ontario

Weeds sprouting along a concrete edge in a lawn area during warm season.

Aerate an Ontario lawn in early fall, while the grass is still growing and well ahead of the first frost, which averages October 16 at Toronto Pearson…