Overseeding Temporary Rye With Fescue – Will It Prevent Germination

Q: I read that winter rye has a pre-emergent chemical in it that prevents weeds from coming up. Will this prevent germination if I overseed my temporary rye with fescue this spring?

A: It is true that annual ryegrass is slightly allelopathic, emitting chemicals that affect nearby plants. But the allelopathy seems to affect small weed seeds rather than large seeds. Since ryegrass/fescue mixtures are commonly planted by professionals, I think it’s unlikely you’ll have a problem.

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