Natural Horticulture Vinegar is non-toxic with 20% acetic acid. Uses Yucca extract as a natural surfactant (sticking agent). Non-selective vegetation killer acts as a dehydrator by stripping the protective coating off the plant’s surface. Ready to use concentrate is quick and convenient. Most effective on warm, sunny days. The heat of the midday sun will turn most plants totally brown 2 to 6 hours after application. Some plants with thick waxy-coated skins may need a second application within 2 to 4 hours. In heat over 85 degrees, or on tender vegetation, you can dilute Horticultural Vinegar 1 to 1 with water. Minimally effective against plants with large root systems such as: Bermuda grass, ivies, brush and trees. A top kill will be apparent, but these plants will most likely resprout in a week or so.