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Easy-To-Follow 4-Stage Lawn Care Program
Pro-Series
By a Series of Numbers on Each Bag of Lawn Food,
Such as 20-5-10
N | P | K |
20 | 5 | 10 |
N = Nitrogen
Nitrogen is necessary in large quantities. It is associated with vigorous vegetative growth and a deep green color.
P = Phosphorus
Phosphorus promotes root growth and formation. It is used in all parts of plant development. Phosphorus application is not needed in most areas of the upper midwest since higher levels are generally found there.
K = Potassium
Potassium is used by plants for overall health, disease resistance and winter-hardiness. For a more precise plant food prescription, obtain a LawnScience® Lawn Soil Sample Kit from your LawnScience® / ClearLake® salesperson.
Stage 1 - Crabgrass Preventer 
Apply LawnScience Pro Series® Crabgrass Preventer 15-0-4 with a .10% Crab-Buster® early to mid-Spring, before soil temperature reaches 60 degrees F or before early germinating crabgrass reaches the 2-leaf stage. It is a unique combination of lawn food and pre-emergent and early post-emergent for control of crabgrass, providing up to 3-4 months control of crabgrass and other annual broadleafs and grasses. It supplies the vital nutrients a healthy lawn needs.
Stage 2 - Weed & Feed
Apply LawnScience Pro Series® Weed & Feed 20-0-5 Mid-April - July when broadleaf weeds are actively growing. The TRIMEC® in Weed & Feed provides post-emergent control of dandelions as well as 200 other broadleaf weeds. It also supplies the key nutrients for a healthy, lush lawn. Apply to damp grass or sprinkle lightly before application. Do not water or mow for 48 hours after application.
Stage 3 - Premium Lawn Food
Apply LawnScience Pro Series® Premium Lawn Food 24-0-6 April - September. This high-quality lawn food provides generous amounts of Nitrogen and Potassium needed for a vigorous, healthy lawn. Nitrogen is supplied in two ways: an immediate release for fast greenup and a slow-release Nitrogen for extended feeding and long-lasting vitality.
Stage 4 - Premium Lawn FoodApply LawnScience Pro Series® Premium Lawn Food 24-0-6 in Late September - November . Fall fertilization is one of the most critical times of the year for lawns which are about to become dormant for the winter period. They need a good nutrient supply to fight off diseases as well as to build up root reserves to survive the winter. The added advantage is that fall fertilization helps get lawns off to a quicker start in the spring.