This weed & grass killer is a non-selective herbicide targeting grassy and broadleaf weeds, moss, algae, and lichens. It is made with naturally derived ingredients, safe for kids and pets once dried, and breaks down quickly in the soil. This product requires no mixing, provides ample coverage, and should be reapplied every 2–3 weeks. The price drops from $21.99 to $18.21. Shipping is free for prime members or on orders over $35.