Royal Flush by Humboldt is a is a salt-eliminating, finishing solution that is designed for application during the final weeks of bloom. This product is also very versatile and can be applied to all varieties of plants, such as flowers, vegetables, herbs, trees, berries, shrubs, ornamental, annuals and perennials. It can also be used on indoor and outdoor plants growing in soil, potting mixes, soil-less rooting media, hydroponics and other gardens. Ensure your plants finish off the life cycle strong with Royal Flush supplement. Quantity: 1 Gallon.