Solarization: Organic Renovation for Crabgrass-Infested Lawns

A Central New Jersey lawn overrun with crabgrass and possibly nutsedge can be renewed without chemicals using soil solarization—a proven, low-cost method that uses the sun’s heat to kill weeds, seeds, and pathogens.

1. Mow weeds as low as possible.
2. Till the area.
3. Soak soil deeply (2–3 feet wet).
4. Spread aged manure or alfalfa meal evenly.
5. Water again to activate.
6. Cover with clear plastic sheeting (painter’s drop cloths), sealing edges with soil or mulch.
7. Leave 6 weeks (or all winter).
8. Remove plastic, till lightly, and seed or sod with quality grass (e.g., Kentucky bluegrass for full sun).

The moist, nitrogen-rich environment under plastic generates heat and toxic compounds that sterilize the top soil layer. No herbicides, no residue, safe for kids and pets. Do not till after solarization—deep dormant weed seeds could resurface.

Resources: UCANR solarization article, Montana State guide.