Crabgrass seeds can remain dormant for over 15 years. Ortho has a new
product out called "Weed-B-Gone Crabgrass Killer," and I'm currently
trying this out on a fescue lawn. Traditionally, you apply a
pre-emergence in early spring, then apply again after 90 days.
Overseeding helps a lot. Mow high and often. Crabgrass likes hot
sunny bare areas. You can pull them out by hand, if there is not too
much. Whatever you do, do not let the crabgrass produce more seed!
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