Killzall Quick is rainproof in 10 minutes, and reaches the roots in 1 to 2 hours. Visible results in as little as 3 hours. May be applied when temperatures are as low as 50 degrees.

How quickly does Killzall work?

Answer: If the plant is actively growing (not just green), is not under cold stress or drought stress or recently mowed you should see results within 1-3 weeks depending on the type of plant. A second application may be needed after 4 weeks for very hard to kill plants (woody stemmed plants or vines).

What is the fastest grass killer?

Best Fast-Acting Weed Killer: Ortho Groundclear Weed & Grass Killer. Ortho’s Groundclear is a fast-acting weed killer that’s good for patios, plant beds and vegetable gardens.