They say that the best time to add corn gluten is when the forsythia is in bloom. In most areas this is happening now so if you have a crabgrass issue with your lawn it is certainly worth a try. Apart from suppressing the germination of weed seeds (and grass seed so don't use it at any time you have reseeded your lawn) it contains up to 10% nitrogen so will also help with the greening up of your lawn.
Crabgrass is an annual grass weed so pulling them before they seed in the fall also helps control this. It also likes compacted soil low in calcium so adding compost, lime and compost tea may help.
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