How long does Preen Garden Weed Preventer last in the soil?
Preen Garden Weed Preventer can be reapplied every 8 to 12 weeks. The rate at which Preen Garden Weed preventer biodegrades in the soil and loses its effectiveness will depend on temperature, soil type, and moisture conditions of the soil. Preen Garden Weed Preventer will need to be reapplied more often in hot, humid conditions.
