Ornamental · Poaceae
Zoysia Grass
Zoysia japonica
Tough, dense, and drought-tolerant once it takes hold, zoysia trades a slow start for a lawn that wears like iron.
Full sun
Every 5–10 days
365–1095 days
USDA 5–11
Overview
Zoysia is a warm-season lawn grass from East Asia that forms a dense, fine carpet built to take foot traffic. It spreads sideways by stolons above ground and rhizomes below, weaving a thick mat that crowds out most weeds once it fills in. Gardeners reach for it where they want a hard-wearing, drought-tolerant lawn that holds up to play and heat.
The trade-off is patience. Zoysia is slow to establish and can take two or more seasons to knit together from plugs or sprigs, and it turns straw-brown and dormant through winter before greening back up in late spring. Once it has settled in, though, it asks for little water and stands up to wear, salt, and dry spells better than most lawn grasses.
It suits a wide stretch of the country, holding from the cold edge of USDA zone 5 down through zone 11. The most cold-hardy types belong to Zoysia japonica, while finer-bladed kinds trade some winter toughness for a smoother look.
Care
The short version: give it full sun, mow short with a sharp reel mower, and water deeply only when the blades start to fold. Feed lightly through summer, dethatch every year or two, and let it go brown and dormant in winter without a fight.
Light
Zoysia does best in full sun and thins out in deep shade. It will hold in partial sun or light shade better than many warm-season grasses, but the denser, healthier turf always comes from the brightest spot you can give it.
Water
Once established, zoysia is genuinely drought-tolerant and you water only when it asks. Wait until the blades fold, wilt, or turn blue-gray, then water deeply with about 0.5 to 0.75 inches at a time. Letting it slide into summer dormancy during a dry spell is a fine way to save water.
Soil
It adapts to most ground as long as it drains, whether that's loam or sandy soil. Aim for a pH of 6.0 to 6.5, slightly on the acidic side, and the grass settles in well.
Temperature
As a warm-season grass it thrives in heat and shrugs off summer highs near 100°F (38°C). It survives winter cold down to roughly 10°F (-12°C) by going dormant, with the hardiest strains taking the coldest sites.
Humidity
Ordinary outdoor humidity is all it needs, so there is no figure to chase. Airflow and quick-drying turf matter more, since damp, crowded conditions are what invite large patch disease.
Feeding
Feed through the warm months, roughly May through August, with a moderate amount of nitrogen at about 2 to 4 pounds per 1,000 square feet a year split across several rounds. Go easy in fall, because heavy late nitrogen drives thatch and feeds disease.
Pruning
Mow short, around 1 to 2.5 inches (2.5 to 6 cm), ideally with a sharp reel mower, because the tough blades dull a rotary and lead to scalping. Dethatch every year or two whenever the thatch layer climbs past about half an inch.
Repotting
none
Size & spacing
The blades themselves stay low at 1 to 2 inches (3 to 6 cm) tall as a mowed lawn. Each plant spreads wide by runners, from about 1 to 10 feet (30 cm to 3 m), which is why a few plugs can eventually fill a whole yard.
When to plant
Zoysia is a warm-season grass, so it goes in once the soil has warmed and it spreads slowly from there. Lay sod, set plugs, or scatter sprigs from late spring into early summer, and start seed of Zoysia japonica from April through July. Either way, plan on two or more seasons before the lawn fills in fully.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Sod, plug, or sprig in late spring to early summer once soil is warm; seed (Z. japonica only) April-July
- Harvest: Inconspicuous spikelike seedheads in late spring to summer; grown for turf, not bloom
Hardiness
USDA hardiness zones: 5–11
Temperature: down to -29°C
Troubleshooting
Most zoysia complaints trace back to its slow pace and its winter habits rather than to anything going wrong. Learn to tell normal dormancy and slow fill-in from real trouble like thatch and large patch, and you'll save yourself a lot of needless worry. Match what you see below before you reach for a treatment.
Large brown circles of thinning turf in fall or spring
This is large patch, a Rhizoctonia fungus that flares in cool, wet soil and feeds on excess nitrogen. The rings spread when soil sits around 65°F to 75°F (18°C to 24°C), and the outer leaves pull away with orange-brown rotted sheaths. Apply a labeled fungicide as soil cools toward 70°F (21°C) in fall, improve drainage, cut the thatch, and hold off on fall and early-spring nitrogen.
Fix:
- Apply a labeled fungicide preventively in fall when soil cools to about 70 degrees F
- Improve drainage and reduce thatch
- Avoid fall and early-spring nitrogen and over-watering
- Water early in the day so turf dries quickly
New plugs and sprigs that take years to knit together
This is slow establishment, and it is normal for zoysia rather than a sign of failure. The grass spreads by runners at its own unhurried pace, so plugs set too far apart or installed late only widen the gaps. Keep the new area watered and weeded, space plugs closer or lay sod for fast cover, and feed lightly through the growing season to speed it along.
Fix:
- Be patient; keep newly planted area watered and weeded
- Space plugs closer (e.g. 6 in centers) or use sod for faster cover
- Control weeds while turf fills in
- Apply light, regular fertility during the growing season to speed spread
Spongy turf with heavy thatch that scalps when you mow
A thick layer of thatch builds up under zoysia's dense growth, and too much nitrogen makes it worse. Walk on spongy turf or mow it low after letting it grow tall and the mower shaves brown, scalped patches. Dethatch every year or two, mow often with a sharp reel mower so you take only a third of the blade, and ease off the fertilizer.
Fix:
- Dethatch with a vertical mower or power rake every year or two
- Mow regularly at the recommended height with a sharp reel mower
- Avoid excess nitrogen that drives thatch
- Keep mower blades sharp and mow frequently enough to remove only one-third of the leaf
Straw-brown lawn in fall that is slow to wake in spring
This is winter dormancy, the normal behavior of a warm-season grass once frost arrives. The blades go brown but the crowns and runners stay alive and green back up when the soil warms, and cool spring soils simply stretch the wait. Skip the urge to force it with fertilizer, and if patches stay brown and rot at the base into spring, check for large patch disease instead.
Fix:
- Expect dormant brown color from first frost until warm spring weather; no treatment needed
- Avoid heavy traffic on dormant turf
- Do not over-fertilize to force green-up; wait for warm soil
- If patches stay brown and rot at the base in spring, check for large patch disease
Toxicity
Good news for pet owners and parents: zoysia is a plain lawn grass with nothing poisonous in it. Cats, dogs, horses, rabbits, livestock, and birds can all be around it and nibble the blades without harm. The only thing worth a mention is grass pollen, which can set off hay fever in people who are sensitive.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Safe to be around. A cat that nibbles the blades might cough one up now and then, but that's a hairball habit, not poisoning.
Dogs None
No toxin here, so a dog can romp and graze on the lawn freely. The odd bout of grass-eating and mild vomiting is normal and harmless.
Horses None
Turfgrass like this is part of the ordinary forage horses graze, and it carries nothing poisonous.
Rabbits None
Rabbits can nibble the blades without any worry, since the grass holds no harmful compound.
Livestock None
Cattle, goats, and sheep can graze the foliage safely; it sits among the common pasture grasses.
Birds None
Backyard hens and wild birds peck through the lawn with no risk from the grass itself.
People None
The grass poses no poisoning risk to children or adults. The only catch is grass pollen, which can stir up hay fever in people who are prone to it.
The grass itself is not poisonous. Grass pollen can trigger hay-fever allergies in sensitive people, and pets that nibble grass may occasionally vomit, but this is not a sign of poisoning. Rarely, grass awns can cause mechanical irritation.
Varieties
Zoysia comes in a few species and hybrids that trade off texture, shade tolerance, and cold hardiness. These are the ones you'll run across when shopping for sod, plugs, or seed.
Zoysia japonica (e.g. Meyer, Zenith, Compadre)
This is the coarsest and most cold-hardy zoysia, the only species you can buy as seed, and the source of Meyer, the type once sold as a miracle grass.
Zoysia matrella (manilagrass)
Finer in the blade and better in shade than Z. japonica, though it grows slower and won't take the cold as well.
Emerald (Z. japonica × Z. tenuifolia)
A fine-textured hybrid grown for its dense, good-looking turf, but it handles winter less well than Meyer.
How to propagate
Zoysia is almost always grown from living plant parts rather than seed, and even where seed works it goes slowly. Here is how each route plays out.
DivisionModerate
Late spring to early summer once soil is warm · 2 or more growing seasons to fully fill in
Almost all zoysia is started vegetatively, and the hybrids can only be grown this way. Lay sod for the fastest cover, set plugs about 6 to 12 inches apart, or scatter sprigs in late spring once the soil is warm. Whichever you choose, plan on two or more growing seasons before the lawn knits fully together.
SeedModerate
April to July · Germinates in about 2-3 weeks, then 6-8+ weeks to establish; slow overall
Seed is an option only for Zoysia japonica, such as Zenith or Compadre. Sow from April through July and expect germination in about 2 to 3 weeks, followed by another 6 to 8 weeks or more to take hold. A seeded stand fills in slower and patchier than sod, so it rewards patience.
Myths
Zoysia is a no-care miracle grass that stays green all year, never needs mowing, and chokes out every weed overnight.
Zoysia makes a fine, tough, drought-tolerant lawn, but the miracle billing oversells it. It can take two or more seasons to fill in from plugs, turns straw-brown and dormant through winter, builds thatch, and still asks for mowing, feeding, and disease care. It is a good grass, not a hands-off one.