For new plantings, add 1-2 tsp per gallon of soil and mix thoroughly OR add 1-2 lbs per cubic yard. For established plants, lightly mix 1-2 tsp per gallon into the soil surface every other month during the growing season.
In spring and fall, apply 10 lbs per 1,000 square feet and water in well. Results may be enhanced if applied following aeration. For new lawns, apply 10 lbs per 1,000 square feet and mix into top 3″ of soil before seeding or sodding.