Question 1

How much fertilizer should I apply?

Accepted Answer

The amount depends on three things: your fertilizer's NPK ratio (the nitrogen percentage), your target nitrogen rate per area (typically 0.5-1 lb N per 1000 sq ft for lawns), and your total area. This tool multiplies them together: fertilizer = target N ÷ %N × area.

Question 2

What does NPK mean on a fertilizer bag?

Accepted Answer

NPK stands for Nitrogen (N), Phosphorus (P2O5) and Potassium (K2O). A 10-10-10 fertilizer contains 10% of each by weight. The first number (nitrogen) drives leafy green growth, phosphorus supports roots and blooms, and potassium strengthens disease resistance.

Question 3

How often should I fertilize my lawn?

Accepted Answer

Most lawns need 2-4 feedings per year totaling 2-4 lb of nitrogen per 1000 sq ft annually. Apply in early spring, late spring, early fall and (cool-season grasses) late fall. Always water after applying and never exceed 1 lb N per 1000 sq ft in a single application to avoid burn.

Question 4

Can I use too much fertilizer?

Accepted Answer

Yes. Over-fertilizing burns roots and grass, pollutes runoff water and causes algae blooms in nearby ponds. Never apply more than 1 lb of nitrogen per 1000 sq ft in one feeding, and avoid fertilizing before heavy rain.