Let the sun clean your soil
Soil solarization is an effective nonchemical way to control weeds and many diseases in planting beds. You trap solar heat under plastic sheets; the soil bakes, killing weeds and disease organisms.
If maximum air temperatures stay between 85° and 95°, the process takes 6 to 8 weeks; if it’s cooler, 8 to 10 weeks. (The process won’t work at 70° or below.)
1. Cultivate the soil in beds at least 30 inches wide. Rake to level the surface. Soak the soil to a depth of 12 inches using a hose or sprinkler.