Q: I have a patch of yard with intruders. A lawn company sprays my yard and I’ve tried Round Up crabgrass killer and a Bayer Advanced weed killer, but the intruders are still there. They’re limited to an area between my driveway and a neighbor’s, and I’m hoping to keep them from spreading. Any suggestions you can offer would be greatly appreciated. – Jim D.

A: The invader is crabgrass, as you indicated, which is an annual weedy grass that grows each year in the spring from seed deposited in previous growing seasons, dropped by the seed heads evident in the photo. Crabgrass seedheads are three-pronged in a pattern shaped like a goose’s foot.

Although there are "crabgrass killers" that can be applied to actively growing crabgrass, they aren't very effective once the crabgrass reaches a c

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