Organic Pro 8-3-3 with 3% Sulphur is an excellent spring fertilizer to use across the board. It seems to work especially well with blueberry bushes. Some local gardeners are seeing impressive growth when it is paired up with Blueberry Booster. Apply approx. 100g (¼ lb) per plant of Organic Pro early in the growing season. For general usage a good rule of thumb is 1½ lb per 100 sq. ft.