Zoysiagrass Lawn Care Guide for California

Nitrogen Budget for the Season

Aim for about 2 lbs of nitrogen per 1,000 sq ft across the season, and treat 3 lbs as the ceiling. Split that total across the growing months rather than applying it all at once — a spring green-up feeding and a summer feeding are the two anchor points, with a low-nitrogen, high-potassium application in early fall to help the lawn harden off before dormancy. Always match the rate on the bag to the area you're covering, and confirm the product label for your specific fertilizer.

Mowing Height Through the Season

Zoysiagrass does best kept in the 1" to 2" band, and the target for spring, summer, and fall alike is about 1½". That height sits in the sweet spot for density without scalping.

In early spring, a single low reset cut — down to about 1" — clears out the previous year's dormant thatch and speeds green-up. Do this only once at the start of the season, bag the clippings, and then return to the normal 1½" height for the rest of the year. At any mow, never remove more than one-third of the blade in a single pass; if the lawn has gotten tall, step the height down gradually over two or three cuts instead of scalping it back in one go.

The Seasonal Schedule

Pre-emergent herbicide is the first job of the year, timed to soil temperature rather than the date on the calendar — apply as soil rises through about 55°F, generally between Jan 30 and Feb 27, to get ahead of summer annual weeds before the lawn fills in.

Spring green-up fertilizer follows once soil is consistently above about 65°F and roughly half the lawn has visibly greened up, typically Mar 7 to Apr 4. Spring core aeration fits in shortly after, once the lawn is actively growing with soil above 65°F and 75% or more green-up, generally Apr 9 to May 21.

The early-summer seeding window — for renovation or filling in bare patches — opens once soil is reliably in the 65–70°F range and nights stay warm, roughly Apr 4 to May 30. This gives the grass a full growing season to establish before the next dormancy, which is why warm-season grass is not seeded in fall.

A second fertilizer application lands during peak summer growth, roughly May 10 to Jun 21, when the lawn is taking up nitrogen fastest. A wetting agent, if dry patches are a recurring problem, is best applied before the heat peaks — roughly May 1 to Jun 30 — and reapplied through the summer as needed.

As summer turns to fall, a fall pre-emergent timed to soil cooling through about 70°F (roughly Aug 28 to Oct 3) heads off winter annual weeds like annual bluegrass, henbit, and chickweed before they germinate. An annual soil test in early fall, while the grass is still active, helps guide any lime or nutrient adjustments. Close out the year with the fall potassium application, roughly Sep 22 to Nov 3, to support cold hardiness heading into dormancy.

Watering

Aim for about ¾" of water a week, split into two deep soakings of about ½" each, watered early in the morning so the lawn dries out before night — wet grass overnight invites disease. In sustained heat, that weekly target rises: by about a quarter inch once highs sit near the mid 80s, and up to about a half inch on top of the base target when three or more days run near 90°F. Cap watering there so the soil can absorb it without runoff, and always water deep and infrequent rather than little and often, so roots are encouraged to grow down.

Timing Conflicts to Watch

A couple of common products interact with seeding in ways that are easy to miss. If you've recently applied a broadleaf herbicide, wait about 6 weeks (42 days) before seeding — the herbicide can prevent new grass from establishing if the two overlap. If you've recently applied a crabgrass pre-emergent, wait longer still: about 12 weeks (84 days) before seeding, since that product is designed specifically to stop seeds — including grass seed — from germinating.

The same logic runs the other direction in fall: a fall pre-emergent for winter weeds also blocks grass seed, so it isn't compatible with a fall overseed. Since zoysiagrass itself is never seeded in fall anyway, this mainly matters if you're overseeding with a cool-season grass for winter color — do one or the other, not both in the same window.

Gear this schedule assumes

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Rain gauge

Any $10 gauge works. You need it to hit the 0.75 in/week target above without guessing.

Soil thermometer

The seed and pre-emergent windows above are soil-temperature windows — a $15 probe beats calendar guessing.

Broadcast spreader

Needed for even fertilizer and seed rates. A basic rotary spreader covers most lawns.

Oscillating sprinkler + hose timer

Enough to water deeply and consistently if you have no in-ground system.

Smart irrigation controller

Only if you have an in-ground system — a Rachio-style controller automates the watering schedule.

None of this needs to be exact to the day — soil temperature and the condition of the lawn matter more than the calendar. Confirm every product's label for your grass type and application rate before spraying or feeding; the label is the law, and it will always have the final word over general guidance like this.

More guides

Zoysiagrass in other states

Georgia · Missouri · North Carolina · Texas · Virginia

Other grasses in California

Bermudagrass · Fine Fescue · Kentucky Bluegrass · Perennial Ryegrass · Tall Fescue