Raise pH with these all natural pH adjusting crystals. Earth Juice Natural pH Up can be used to adjust fertilizer and foliar spray solution for a much more effective use and faster absorption of nutrients by plants. Optimal pH range for fertilizer/nutrient solution for most plant and turf is 5.5 - 6.5. Add crystals in small amounts. Mix solution thoroughly and adjust pH prior to application. Use the solution that day. Will vastly improve all fertilizer solutions performance. 2 lb. bottle.