Removing Contractor's Mix or Winter Rye from a Northeast Lawn

After excavating work, a Northeast homeowner finds a grass that grew all winter, longer and different from their regular seed. Called "contractor's mix" or "winter rye," they want to eliminate it. The expert outlines two approaches:

1. If establishing a different grass: prepare soil by tilling and raking. This may suffice. If not, use glyphosate (Roundup) on actively growing vegetation. Mow short and water to stimulate growth before spraying. Wait 7-10 days, then prepare ground and sod immediately.
2. If seeding: check if a pre-emergent weed killer can be used, but follow label meticulously as it affects all seeds equally.

The key is timing herbicide application when the unwanted grass is actively growing for maximum effectiveness.