10-20-20 Lawn and Garden Fertilizer10 20 20 Lawn and Garden Fertilizer 10 20 20 Fertilizer is designed to promote strong root development and enhance flowering and fruit production due to its high phosphorus and potassium content. Ideal for establishing lawns and nourishing flowering or fruiting vegetables, this formula supports vigorous plant growth where bloom and fruit yield are priorities. It may be less suitable for plants requiring higher nitrogen levels for leafy growth.