When should I apply pre-emergent to Zoysia grass?

Apply BEFORE soil temperatures reach 55°F at the 4-inch depth — that's when crabgrass germinates, so the chemical barrier must already be in place. In most of the Zoysia belt that's late February to early March. Use a split application with a granular first round followed by a liquid round 30–60 days later, then a fall round when soil drops to 70°F to catch Poa annua.

How short can I cut Zoysia grass?

Coarser Z. japonica runs 1–2 inches with a rotary mower. Finer Z. matrella and tenuifolia varieties go down to 0.5 inch but only with a reel mower. Match height to cultivar — going below 1 inch on coarse Zoysia leaves brown tips.

Why is my Zoysia slow to green up in spring?

Zoysia is one of the latest warm-season grasses to wake up. Fertilizing too early actually slows it down — you push nitrogen the plant can't yet use. Wait until the lawn is roughly 50% green before any nitrogen. A light spring scalp removes dead winter material and speeds green-up by 1–2 weeks.

Should I dethatch my Zoysia lawn?

Never use a consumer spring-tine dethatcher on Zoysia — it rips up the rhizome and stolon network and Zoysia recovers slowly. If thatch exceeds 1/2 inch, verticut (vertical mowing with bladed equipment) in May or June during peak growth.

How much nitrogen does Zoysia need per year?

2–4 pounds of actual nitrogen per 1,000 square feet per year — less than Bermuda. Split across 4–5 applications from spring green-up through August. Use a 4-1-2 ratio fertilizer like 16-4-8. Stop nitrogen 60 days before your average first frost to avoid large patch.

What's the best weed killer for Zoysia grass?

Celsius WG is the specialty go-to — it kills over 200 broadleaf and some grassy weeds with no temperature limit. For crabgrass, use quinclorac (Drive XLR8). At the big-box store, Spectracide Weed Stop and BioAdvanced All-in-One are reliable. NEVER use atrazine on Zoysia — on home lawns it is for Centipede only. It is not a St. Augustine option either: Floratam, the most common cultivar, is not tolerant of it (Texas A&M EHT-144).

Is Zoysia grass good for shade?

Zoysia tolerates partial shade better than Bermuda, needing 6–8 hours of sun. Varieties like Zeon and EMPIRE handle 4–6 hours of filtered light. For heavy shade (under 4 hours of direct sun), St. Augustine or a cool-season shade mix is a better choice.

What temperature does Zoysia grass go dormant?

Zoysia goes dormant when soil temperatures drop below 50°F and air temperatures stay consistently below 50°F. It is more cold-tolerant than Bermuda and grows in zones 6–10. The lawn turns tan but stays alive — it will green up again in spring once soil warms to 65°F.

Warm SeasonZones 6 – 10Sun / Light Shade

The Complete Guide to
Zoysia Grass

Dense, slower-growing, and tougher than Bermuda in shade. Mowing heights, fertilizer schedules, weed control, seasonal timing, and the most common problems — built for your zone.

Right now: slowing

October — Apply 2nd fall pre-emergent (split with August) for Poa annua control

All Grass Guides|

Bermuda·Zoysia·St. Augustine·Centipede·Fescue·KBG·Ryegrass·Bentgrass

Quick Reference

Mow Height

1 – 2"

Coarser Z. japonica mows 1–2" with a rotary. Finer Z. matrella / tenuifolia 0.5–1.5" with a reel mower.

Water / Week

Deep and infrequent. Early morning only. Avoid late watering — humidity invites disease.

N per Year

2 – 4 lbs

Per 1,000 sqft. Lower than Bermuda. Split into 4–5 apps from green-up through early fall.

Best Zones

6 – 10

More cold-tolerant than Bermuda. Goes dormant below 50°F soil temp.

Soil pH

6.0 – 6.5

Slightly acidic. Lime if below 5.8, pelletized sulfur if above 7.0.

Sun Needs

Sun / Light Shade

6–8+ hours direct sun. Better shade tolerance than Bermuda but worse than St. Augustine.

What makes Zoysia different

Zoysia is the dense, refined cousin of Bermuda — same warm-season heat tolerance with better shade tolerance, slower spread, and a tighter, more carpet-like canopy. It recovers from damage more slowly than Bermuda, so the goal with Zoysia is to prevent problems rather than fix them. Care is roughly 95% identical to Bermuda with a few key differences: lower nitrogen, slower recovery, more shade tolerance, and verticutting (never spring-tine dethatching) for thatch.

Dense and carpet-likeHeat lovingLight shade tolerantGoes dormant in winterSlower to recoverLower nitrogen needs

Month-by-Month Calendar

Tap a month

October

slowing

Mow

2" every 10–14 days

Water

Rainfall only unless drought

Fertilize

Light potassium only. Stop nitrogen 60 days before first hard frost.

This month's tasks

Apply 2nd fall pre-emergent (split with August) for Poa annua control

Clean up leaves so they don't smother dormant turf

Winterize irrigation system before the first freeze

See the Zoysia month-by-month playbook

The full Zoysia calendar — every task, every month, with priority and timing for every season.

Open the Zoysia calendar

Pre-Emergent Timing

Don't miss this window

Pre-emergent is the single most important application of the year. It prevents crabgrass and other weeds before they germinate. Once you see weeds, it's too late.

Spring (Crabgrass Prevention)

Critical

Apply when your 5-day average soil temperature reaches 55°F. Crabgrass seeds germinate when soil temperatures hold at 55°F for several days at the 4-inch depth. Pre-emergent must already be down BEFORE that — once you see the first crabgrass blade, the chemical barrier is too late. Zoysia's slower recovery makes weed prevention even more important than for Bermuda.

Typically late Feb – early Apr (zones 6 – 10)Varies by zone

Fall (Poa annua (annual bluegrass) Prevention)

Recommended

Apply when your 5-day average soil temperature reaches 70°F. Poa annua germinates as soil temps drop back through 70°F in late summer. Apply your fall pre-emergent BEFORE that threshold — usually mid-August in the Zoysia belt — to prevent the worst winter weed in southern lawns.

Typically Aug – SepVaries by zone

Timing matters more than product. Too early and it breaks down before weeds germinate. Too late and crabgrass is already growing — pre-emergent can't stop what's already up. Track your local soil temperature, not the calendar date.

What to use

Prodiamine 65 WDG (Barricade)

Specialty

Rate: 0.18 oz per 1,000 sqft (split spring + fall)

The gold-standard pre-emergent. Long residual, low rate, no staining. Mix in a sprayer with a marker dye and a quality surfactant.

Scotts Halts Crabgrass Preventer

Home Depot

Rate: 2.7 lbs per 1,000 sqft

Big-box pendimethalin granular. Apply with a spreader before soil hits 55°F. Stains concrete yellow — sweep off hardscape immediately.

Dithiopyr (Dimension 270G)

Lowe's

Rate: 2.3 lbs per 1,000 sqft

Pre-emergent with a few weeks of post-emergent reach-back on baby crabgrass — the only forgiveness window in pre-emergent timing.

How to check your soil temperature

Use a soil thermometer at 2–4 inch depth, or check your local extension office's soil temp map. Look for the 5-day average, not a single reading — one warm day on a zoysia lawn doesn't mean it's time.

What's Safe to Spray

Zoysia handles most selective herbicides well. Here's what's safe and what to avoid — organized by where you'd buy it.

Safe for Zoysia

✓

Scotts Halts Crabgrass Preventer

Pendimethalin

Big-box pre-emergent. Apply BEFORE soil hits 55°F at 4-inch depth. Stains concrete yellow — keep off the driveway.

Safe

✓

Scotts Turf Builder Triple Action

Benefin + 2,4-D + Dicamba (with fertilizer)

Combo pre-emergent + broadleaf killer + fertilizer. Convenient for spring on Zoysia lawns when timing aligns.

Safe

✓

Scotts Turf Builder Weed and Feed

2,4-D + Mecoprop + Dicamba (with fertilizer)

Apply to wet grass so granules stick to weed leaves. Best on actively growing Zoysia in late spring.

Safe

✓

Spectracide Weed Stop

2,4-D + MCPP + Dicamba

Big-box ready-to-spray for dandelion, clover, chickweed, plantain, henbit. Same chemistry as Trimec.

Safe

✓

BioAdvanced All-in-One

2,4-D + MCPP + Dicamba + Quinclorac

Adds quinclorac for crabgrass post-emergent. One bottle handles broadleaf + crabgrass on Zoysia.

Safe

✓

Ortho WeedClear (Northern)

2,4-D + MCPP + Dicamba

Standard 3-way broadleaf mix. Reliable on dandelion, clover, plantain, chickweed.

Safe

Avoid — Will Damage Your Zoysia

Atrazine (Bonus S, Hi-Yield Atrazine)

Atrazine

NOT safe for Zoysia. On home lawns atrazine is for Centipede only — Floratam St. Augustine is not tolerant of it (Texas A&M EHT-144) — it will damage Zoysia.

Unsafe

Tenacity (Mesotrione)

Mesotrione

NOT safe for Zoysia. Mesotrione bleaches warm-season turf. Cool-season lawns only.

Unsafe

Image Kills Nutsedge

Imazaquin

Use with caution — imazaquin can stunt Zoysia. Halosulfuron (SedgeHammer) is the safer nutsedge choice.

Unsafe

A note on Weed & Feed products

Combo products like Weed & Feed are convenient — one bag, one application. But you'll get noticeably better results using fertilizer and weed control separately. Here's why:

Timing: Fertilizer and herbicide have different ideal application windows. A combo forces both at the same time, so one is always off-schedule.

Application: Herbicides work best as a spray that sticks to weed leaves. Granular weed & feed relies on granules physically touching each weed — inconsistent coverage.

Precision: Most lawns don't have weeds everywhere. Spraying weeds where they are costs less and puts fewer chemicals on your lawn than treating the whole yard.

Common Weed & Feed products you'll see at the store

Scotts Turf Builder Weed & Feed

Granular combo (fertilizer + 3-way broadleaf)

Northern formulation. Safe on Zoysia but the timing compromise is real — herbicide and fertilizer rarely need to go down at the same time.

Scotts Turf Builder Triple Action

Granular 3-in-1 (pre-emergent + broadleaf + fertilizer)

Tries to do everything in one bag. Convenient but locks you into a single application window.

Scotts Bonus S Southern

Granular combo (fertilizer + atrazine)

WARNING: contains atrazine — on home lawns that is Centipede only; Floratam St. Augustine is not tolerant of it (Texas A&M EHT-144). Do NOT use on Zoysia. Listed here so you can recognize and avoid the wrong bag at the store.

What to grab instead

Three separate products. Apply each on its own schedule. Better results, less waste, healthier lawn.

Fertilizer

A slow-release 4-1-2 ratio (e.g., 16-4-8 or 24-0-11) at 0.5 lb N per 1,000 sqft, applied when Zoysia is actively growing — not tied to when you need weed control.

Pre-emergent

Prodiamine 65 WDG at 0.18 oz per 1,000 sqft. Apply when soil temps approach 55°F — before crabgrass germinates.

Post-emergent weed killer

Celsius WG for broadleaf and most grassy weeds, or quinclorac (Drive XLR8) for crabgrass. Spot-treat where you see weeds — no need to spray the whole lawn.

Always read the product label before applying. Labels and formulations change — verify the active ingredient and grass safety on the bag before you spray.

Need to check a specific product?Herbicide Safety Checker →

Common Problems

Tap any issue to see symptoms, causes, and exactly how to fix it.

See something weird on your lawn?Ask Larry — send a photo →

Mowing Guide

Mowing is the single most impactful thing you can do for your Zoysia lawn. Here's how to get it right.

Height: 1 – 2 inches

Coarser Z. japonica varieties run 1–2 inches with a rotary mower. Finer Z. matrella and tenuifolia varieties go down to 0.5 inch with a reel mower. Match the cultivar to the height — going below 1 inch on coarse Zoysia tears the grass.

Frequency: Every 5–7 days in peak season

Zoysia grows slower than Bermuda, so the mowing window is more forgiving. Never remove more than 1/3 of the blade in one cut. Sharp blade is non-negotiable — Zoysia is famously hard on dull blades.

Reel vs. Rotary

Reel mowers are preferred under 1.5 inches. Rotary mowers work fine at 1.5–2 inches but need scalp wheels and a sharp blade to avoid frayed tips.

Clippings: Mulch, don't bag

Zoysia clippings break down and return nitrogen to the soil. Only bag after a heavy mow where clumps would smother the grass.

Spring scalp before green-up

Scalp gradually to 50% of your target height when full green haze appears in early spring. This removes dead winter material and lets sunlight reach the crowns. Bag the clippings — Zoysia recovers slowly from heavy debris.

Sharpen blades every 15–20 hours

Zoysia's tough blades dull a mower fast. Dull blades tear the grass and turn the lawn brown at the tips. Sharp blade = visibly cleaner color.

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