I just did my backyard over the past 2 nigths after work.
2 things that really stood out to me while doing this weed work are........
1-my lawn where the crabgrass is, has shallow roots, maybe 3"-4"
2-Where the crabgrass is (and maybe the whole lawn?) that I pull up, there are a TON of worms! And the soil is this rich black pebbly soil. Must be the compost and vermipost mixing together? Cant believe the amount of worms though.
Massachusetts Certified Arborist