Bonide Captain Jack's Deadweed Brew provides fast-acting control of weeds, grass, mosses, & algae within hours. Captain Jack's Deadweed Brew is great for use on visible weeds within vegetable & flower gardens, landscaped areas, & lawns. It can also be used on visible weeds around & on buildings, sidewalks, fences, bark mulch, driveways, patios, & gravel. Approved and suitable for all of your organic gardening needs. Product mixes with water and should be applied as a spray using a standard hand-held or backpack sprayer. Active Ingredients: Caprylic Acid 44%, Capric Acid 36%. Other Ingredients: 20%.