Ornamental · Poaceae
Tall Fescue
Festuca arundinacea
Deep-rooted and easygoing, tall fescue stays green through heat and cold and forgives a beginner's mistakes.
Full sun
Every 5–10 days
61–75°F · 16–24°C
60–90 days
Overview
If you are planting your first lawn, tall fescue is a kind place to start. It is a cool-season bunch grass with roots that reach deep for water, so it handles heat and dry stretches better than most lawn grasses and keeps its color into fall and winter while warm-season lawns fade to brown. It also puts up with more shade, clay, and lean soil than its neighbors, which means you do not need perfect ground to grow a good stand.
There is one habit worth understanding early, and it is nothing to worry about. Tall fescue grows in clumps and spreads only through short rhizomes, so it cannot creep over a bare spot the way some grasses do. That simply makes a light fall overseeding part of your routine, and once you get the density right you are rewarded with a thick, sturdy lawn that takes foot traffic in stride.
One thing to weigh before you plant for animals: most older tall fescue carries a fungal endophyte that toughens the grass but also makes toxins that can harm grazing horses and cattle. A turf lawn stays perfectly safe for your pets and family, and if you are seeding pasture you can simply choose an endophyte-free or novel-endophyte cultivar and set the worry aside.
Care
The short version: give it full sun to a bit of shade, mow on the tall side at 3 to 4 inches, water deeply but not often, feed mostly in fall, and scatter fresh seed over thin spots each fall to keep things full.
Light
Tall fescue is happiest in full sun, yet it is more forgiving of shade than most lawn grasses and holds up in partial sun and even partial shade. If your yard leans shady, just mow it a little taller so it can reach for the light and stay full.
Water
Water deeply but not often, soaking the deep root zone instead of giving daily sprinkles. About an inch a week during active growth keeps it green, and those deep roots let it coast through a dry spell, even easing into dormancy if you skip a watering or two. Let the top half of the soil dry out before you water again.
Soil
This grass settles into a wide range of well-drained soils and puts up with clay and leaner ground better than other cool-season grasses. Aim for a pH between 5.5 and 7.5, which most lawn soils already meet, so there is rarely much to fix.
Temperature
As a cool-season grass, it does its best growing in mild weather, with the strongest top growth between 61°F to 75°F (16°C to 24°C). It greens up nicely through fall and winter, then slows down or browns a little in the hottest weeks of summer, which is normal and nothing to fret over.
Humidity
Everyday outdoor humidity suits it fine, so there is no target number to chase. The one thing to watch is a run of muggy nights, since warm, damp air is what sets up brown patch on the leaves.
Feeding
Feed it mostly in fall, using a nitrogen turf fertilizer at around 2 to 3 pounds of nitrogen per 1,000 square feet a year, split between fall and spring. Go easy on summer nitrogen, which really only feeds brown patch.
Pruning
Mow at 2.5 to 4 inches, and raise the blade toward the top of that range in summer and in shady spots to grow deeper roots and hold off disease. Try never to take more than a third of the leaf height in a single pass, and the lawn will bounce back quickly.
Repotting
none
Size & spacing
A mowed stand sits about 3 to 4 inches (8 to 10 cm) tall, and each clump spreads to roughly 6 to 12 inches (15 to 30 cm). Since the clumps do not knit together on their own, a bit of overseeding fills the space between them and keeps the lawn looking whole.
When to plant
Tall fescue starts from seed, and getting the timing right makes everything easier. Late summer into early fall is the sweet spot, when the soil is still warm but the air has cooled, with early spring as a solid second choice. Plan on a gentle overseeding of thin areas each fall, since this clumping grass will not close those gaps by itself.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Sow seed in late summer to early fall (best) or early spring; tall fescue germinates in about 7-12 days. Overseed thin or bare areas each fall because this bunch-type grass does not spread to fill gaps.
- Harvest: Grown for turf, not bloom; stays green in fall and winter when warm-season grasses are dormant.
Hardiness
USDA hardiness zones: 4–7
Temperature: down to -34°C
Troubleshooting
Most tall fescue troubles announce themselves as thin patches, oddly coarse clumps, or a summer slump in color. The good news is that catching them early makes them easy to turn around. Find what matches your lawn below, then step in while a small problem is still small.
Clumpy patches that will not fill in on their own
Tall fescue grows as a bunch-type grass with only stubby rhizomes, so it cannot creep sideways to close a gap the way spreading grasses do. When summer stress, foot traffic, or disease opens up bare soil, that spot tends to sit and slowly widen rather than heal. The kind fix is simple: overseed the thin areas each fall and keep the fresh seed moist until it settles in.
Fix:
- Overseed thin and bare areas with turf-type tall fescue in early fall
- Loosen or lightly till the bare soil and ensure good seed-to-soil contact
- Keep newly seeded areas consistently moist until established
- Mow at the higher end of the range to thicken stand
Round brown patches when the weather turns hot and sticky
Those circles are brown patch, a fungus named Rhizoctonia solani that wakes up when nights stay above 68°F (20°C) and the air grows muggy. Too much nitrogen and leaves that stay wet overnight only encourage it. Water early in the day so the grass dries fast, ease back on summer feeding, and reach for a labeled fungicide on a prized lawn only if the patches keep marching outward.
Fix:
- Water early in the day so foliage dries quickly, and avoid evening watering
- Reduce nitrogen fertilizer during hot weather
- Improve air movement and drainage
- Apply a labeled turf fungicide on high-value lawns if needed
Summer heat leaves the lawn brown and thin
Tall fescue is a cool-season grass, so even with its deep roots it slows down and can drift into summer dormancy when heat and drought wear on. Water deeply but not often to soak the lower root zone, lift the mower height for summer, and let the fall rains and cooler days coax the color back. Overseed any spots that thin out and the lawn returns full.
Fix:
- Irrigate deeply and infrequently to wet the deep root zone
- Raise mowing height in summer
- Overseed in fall to recover thinned areas
Coarse, pale clumps that stand out in a fine lawn
Those wide, light-green tufts are usually old forage-type tall fescue such as Kentucky 31, whose blades are much coarser than today's turf cultivars. They will not blend in on their own, so dig the clumps out or spot-treat them, then reseed those bare spots with a turf-type tall fescue so the texture matches again.
Fix:
- Dig or spot-treat the coarse clumps
- Reseed the spots with a turf-type tall fescue to match texture
Toxicity
You can relax about a turf-type tall fescue lawn: it is safe for cats, dogs, rabbits, birds, and people, and it does not appear on the ASPCA toxic-plant lists. The real caution is endophyte-infected pasture fescue, where a fungus inside the grass makes toxins that cause fescue toxicosis in grazing horses and livestock. Keep pregnant mares off infected pasture, and pick clean forage cultivars for animals that graze.
Toxic to
Horses · Livestock
Safe for
People · Cats · Dogs · Rabbits · Birds
Horses Caution
The grass itself is safe, but the endophyte fungus hiding in infected pasture fescue is the real hazard. A pregnant mare grazing it can carry her foal too long and then face a thickened placenta, a hard birth, and no milk when the foal arrives. Keep mares off endophyte-infected fescue well ahead of foaling.
Livestock Caution
Cattle and other grazers thrive on clean fescue, but endophyte-infected pasture brings on fescue toxicosis. Keep an eye out for slow weight gain, poor tolerance of heat, and fescue foot, where lameness settles into the hooves and lower legs. Choosing endophyte-free or novel-endophyte cultivars steps around the whole problem.
Cats None
A turf-type tall fescue lawn is safe for cats. A curious cat that chews a few blades might bring them back up once, the way cats do with any grass, but there is nothing toxic in the plant to worry about.
Dogs None
Dogs are just fine on a tall fescue lawn. The grass is not toxic, and the most a leaf-nibbling dog usually gets is a brief bit of stomach upset that passes on its own.
Rabbits None
Tall fescue is a safe grass for rabbits to nibble. It holds no toxin in the plant, and rabbits are not among the animals bothered by the endophyte that troubles large grazing stock.
Birds None
Birds can forage a tall fescue lawn with no harm at all. The grass and its seed are not toxic, and backyard hens are happy to scratch right through it.
People None
A tall fescue lawn is safe around children and adults alike. It is a turf and forage grass rather than a food crop, so there is nothing to eat, but a little contact or the odd chewed blade poses no risk.
A turf-type tall fescue lawn is safe for cats, dogs, and children. Do not graze pregnant mares or cattle on endophyte-infected (E+) tall fescue pasture; pregnant mares should be removed from E+ tall fescue well before foaling. Use endophyte-free or novel/friendly-endophyte forage cultivars for livestock.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
Tall fescue falls into two camps, the rough old forage types and the softer modern turf types, and you will feel the difference underfoot. Here are the names you are likely to meet.
Kentucky 31 (K-31)
This is the rugged old forage and utility grass that got planted just about everywhere, and because it usually carries the toxic endophyte it makes a poor pick for horse pasture.
Rebel
One of the earliest true turf types, it gives you a finer, denser, darker lawn than the coarse old K-31 ever could.
Falcon
A turf-type cultivar you will find blended into many of today's fine-textured lawn mixes.
How to propagate
Tall fescue is nearly always grown from seed, both to start a new lawn and to keep an established one thick with a little fall overseeding.
SeedEasy
Late summer to early fall is best; early spring is the second option. · Germinates in about 7-12 days; establishes a usable stand within a couple of months.
Nearly everyone starts tall fescue from seed, and late summer into early fall is the prime window, with early spring waiting as a friendly backup. Seed sprouts in about 7 to 12 days and grows into a usable stand within a couple of months. Because this bunch grass will not creep to cover bare ground, plan to overseed the thin areas each fall so the lawn stays full.
DivisionModerate
Cool weather of spring or fall · Several weeks
You can split an established clump during the cool weather of spring or fall, and those divisions take several weeks to settle in. It does work, but for anything larger than a small patch, seeding and a yearly fall overseeding are the easier road.
Myths
Tall fescue is harmful to any animal that eats it.
What causes trouble is a fungus that lives inside certain plants, not the grass on its own. This endophyte, Epichloe coenophiala, produces the ergot alkaloids responsible for fescue toxicosis, and growers can now choose endophyte-free or friendly-endophyte cultivars that leave the problem behind. A turf-type tall fescue lawn is safe for pets and people, and clean forage cultivars graze safely for livestock.