Zoysia lawn care calendar

Zoysia is slow to wake up and slow to recover, so spring is about not rushing it. Two things happen in the wrong order every year: people feed the lawn before it is actually growing, and they put pre-emergent down after crabgrass has already germinated.

Pre-emergent (a product that stops weed seeds before they sprout, so it only works ahead of germination) goes down mid-February to early March per NC State. That is a starting window, not a date: refine it with your local soil temperature, because crabgrass germinates near 60°F and the pre-emergent has to already be in place.

First nitrogen waits until about three weeks after green-up, at ½ pound of nitrogen per 1,000 square feet. Feeding a lawn that has not greened up yet pushes growth the roots cannot support. Use a fertilizer with a 3-1-2 or 4-1-2 N-P-K ratio.

Mowing starts as soon as it is growing: keep it under 1½ to 2½ inches.

Thatch: after green-up, vertically mow only if the thatch layer is thicker than ½ inch.

If you see large patch: do not apply nitrogen until the lawn has visibly started to improve. Feeding a diseased zoysia lawn makes the patch worse.

Warm weather is when zoysia actually recovers, so this is where the fertilizer goes.

Apply ½ to 1 pound of nitrogen per 1,000 square feet in late June or early July, then repeat in mid-August. Across the whole year, never exceed 4 pounds of nitrogen per 1,000 square feet.

Post-emergent herbicides (which kill weeds already growing) only go out when the grass is actively growing and not drought stressed. Spraying a lawn that is already struggling in summer heat damages the turf along with the weed.

Thatch: vertically mow in June or July if it is needed.

The single most common zoysia mistake is a fall nitrogen application.

Do not apply nitrogen in September through November. Late nitrogen pushes tender growth into cold weather and feeds large patch. Apply 1 pound of potassium (potash, K₂O) instead, which supports cold hardiness.

Large patch prevention is the fall job that matters. If your lawn has a history of it, apply fungicide when soil temperatures consistently reach 70°F, and make two applications 21 to 28 days apart. That soil temperature trigger is why a calendar alone cannot time this: watch the number on the soil temperature tracker.

December through February: do not fertilize. Water only occasionally, and only if a drought occurs.

Every rate below is nitrogen per 1,000 square feet, from the NC State zoysiagrass maintenance calendar. "N" means nitrogen, the first number on a fertilizer bag.

When	What to apply	Rate
About 3 weeks after green-up	Nitrogen (3-1-2 or 4-1-2 ratio)	½ lb N
Late June or early July	Nitrogen	½ to 1 lb N
Mid-August	Nitrogen	½ to 1 lb N
September to November	Potassium only, no nitrogen	1 lb K2O
December to February	Nothing	—

Annual ceiling: 4 pounds of nitrogen per 1,000 square feet. Zoysia is not a lawn that rewards more feeding, and excess nitrogen drives thatch and disease.

Not sure how many pounds of your specific bag that works out to? The fertilizer calculator turns a target N rate and your square footage into pounds of product.

Zoysia needs 0.5 to 1 inch of water a week, and it should soak in to a depth of 4 to 6 inches. Deep and infrequent beats a light daily sprinkle: shallow watering grows shallow roots.

Sandy soil drains faster and holds less, so NC State suggests roughly ½ inch of water every third day instead.

In fall, water minimally, but do water if the soil has gone powder dry. In winter, water only occasionally and only during drought.

You do not have to guess how long that takes. Put out a few straight-sided cans, run your sprinklers 15 minutes, measure what you caught, and the irrigation runtime calculator converts it into minutes per zone.

There is no calendar date for this, and any page that gives you one is guessing. Zoysia green-up is driven by soil temperature and it moves by weeks from year to year and from the top of its range to the bottom.

What that means practically: wait for visible green-up before you push fertility, then count about three weeks from there to your first nitrogen. Zoysia is genuinely slow to green up compared with bermuda, and a thin, patchy-looking lawn in early spring is usually normal rather than a problem to fix with fertilizer.

Track the actual number for your address on the soil temperature tracker, which shows readings at surface, 2 inch, and 6 inch depth for any US ZIP.