Test soil pH before use. If soil is alkaline (pH exceeds 7), use Alumunim Sulphate to lower the pH. Apply ever 3-4 weeks as needed. For potted plants dissolve 3/5 tsp to 1 quart water and drench soil with mixture. For gardens apply early in the spring using 1lb/ 100ft2 or 2-4 tbsp per medium sized individual plant. work into the surface of te soil and water well. do not exceed label application rates. Lowering the pH below 5 may causenutrient deficiencies and possible aluminum toxicity.