Question: how much oyster shell per gallon of soil?
Answer: For new plantings, add 1-2 tbsp per gallon of soil and mix thoroughly OR add 0.5-1 lb per cubic yard. For established plants, lightly mix 1-2 tbsp per gallon into the soil surface every other month during the growing season. Lawns: In spring and fall, apply 2.5-5 lbs per 100 square feet and water in well.