We love this fertilizer! We use 1/3 of a packet per #1 container or one packet per #3 container. 2 packets per #15 containers. Works great on perennials, grasses, trees, shrubs and a little with annuals really gets them to thrive. We don’t recommend for use on azaleas, rhododendrons, blueberries, microbiota, mountain laurel or leucothoe.