Corn gluten meal (CGM) is a byproduct with pre-emergent activity on crabgrass. Iowa research showed 50% control; Southern trials (Arkansas, Florida) found <50% or no control after 10 weeks. Synthetic pre-emergents achieve 80–100% control for 20 weeks.
Cost: ~$1.50/lb. Sources: local nurseries or online.
crabgrass roots were very vigorous after corn gluten meal was applied
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