Fertilize at the Right Time: Seasonal Feeding for a Greener, Healthier Lawn

1Why Lawns Need Fertilizer

Grass removes nutrients from the soil as it grows. Over time, lawns become depleted of key nutrients — especially nitrogen, which drives green color and leaf growth, phosphorus, which supports root development, and potassium, which improves stress tolerance and disease resistance. Without periodic feeding, lawns become thin, pale, and vulnerable to weeds and disease.

Lawn fertilizer bags display three numbers such as 20-5-10, representing nitrogen (N), phosphorus (P), and potassium (K) respectively. Choosing the right ratio depends on your lawn’s specific needs, which a soil test can help identify.

2Know Your Grass Type First

3Best Time to Fertilize Cool-Season Lawns

Early fall is often considered the most important fertilizing period for cool-season lawns. Fall fertilizing strengthens roots, supports recovery from summer stress, and improves spring green-up. A late-fall application can also help prepare the lawn for winter dormancy.

Light spring fertilizing supports healthy growth, but avoid excessive amounts — too much spring nitrogen creates weak, shallow growth before summer heat arrives and puts the lawn at greater risk of drought stress.

4Best Time to Fertilize Warm-Season Lawns

Warm-season grasses should be fertilized after active growth begins — typically during late spring or early summer. Applying fertilizer too early while grass is still dormant wastes product and can cause uneven results. Avoid fertilizing during heat waves or drought stress, which can increase the risk of fertilizer burn.

5Granular, Liquid, and Slow-Release Options

Granular fertilizer is the most common type and offers easy application with slow-release options for longer feeding periods. Liquid fertilizer absorbs more quickly and is often used for spot treatments or fast green-up. Slow-release fertilizers are popular with homeowners because they provide more consistent growth, reduce burn risk, and require less frequent application overall.

Always water granular fertilizer in after application to help nutrients move into the soil, and follow product instructions carefully. Use a broadcast or drop spreader for even coverage — uneven application creates dark green stripes, burn spots, and inconsistent growth.

6Common Fertilizing Mistakes to Avoid

The most common mistakes include fertilizing at the wrong time of year for your grass type, applying too much product (which can burn the lawn), fertilizing dry or heat-stressed grass, and ignoring grass type when selecting a schedule. Signs of fertilizer burn include brown streaks, yellow patches, and damaged grass tips. If burn occurs, water deeply and allow the lawn to recover before reapplying.