Rose Tone breaks down slowly so unless you have really fast draining sandy soil, you should not have to fertilize more often.

The Rosetone will gradually fertilize as it rains. Everytime it rains, the rosetone will break down and be absorbed in the rain water more and fertilize the soil. In short, no you don't need to fertilize more often as the Rosetone will fertilize long term in conjunction with the aid of the rain.