Gro-Sure Ericaceous Controlled Release Plant Food take the effort out of feeding your acid loving plants like Azaleas, Camelias and Rhododendrons. The feed will sit in the soild and feed the plant for up to 3 months before you need to feed again. It has extra iron in the mix to give the plant greener leaves. Gro-Sure Ericaceous Controlled Release Plant food comes in a 900g bottle.