weed and grass killer spray

Products use different approaches: contact dehydration-type formulas (often water plus essential oils and a surfactant), herbicidal soaps (ammoniated fatty-acid soaps), and systemic root-killing/preventer formulas that kill to the root and create a soil barrier to inhibit new growth.

Replanting guidance varies by product: some allow planting flowers, trees, and shrubs after about 1 day, others recommend waiting about 5 days, and some preventer formulas advise waiting around 4 months before planting sod, seed, or ornamentals. Always follow the specific product label for exact replanting intervals.

Rainproof times vary by formula: some products state they become rainproof in about 15 minutes after application, while others note rainproof performance at about 30 minutes. Check the product label for the exact rainfast time.