Ornamental · Poaceae
Blue Fescue
Festuca glauca
A tidy silver-blue tuft that's happy on the hot, dry, lean ground where pickier plants sulk.
Full sun
Every 7–14 days
USDA 4–8
8–12 in · 20–30 cm
Overview
Blue fescue is a small, neat ornamental grass that rounds up into a silver-blue tuft about a foot tall. It's originally from the cooler parts of Europe, and it earns its keep with color and shape instead of size, holding that tidy dome all season. Want it to really pop? Plant it where the blue can catch the light next to gravel, dark mulch, or some greener neighbors.
Honestly, it does best when you mostly leave it alone. Give it full sun and sharp drainage in lean or even rocky soil and it'll laugh off drought and cold right down to zone 4. What it can't stand is rich ground and soggy roots, which leave it floppy or rotted, so the move is to plant it tough and go easy on the water.
There's just one thing to keep in mind, and that's its short life. A clump tends to empty out from the middle after 2 to 3 years, so figure on dividing it or starting over now and then. Do that, keep it sunny, and you'll have a row of crisp blue domes coming back year after year.
Care
The short version: full sun, lean and sharply drained soil, and not much water once it's settled in. You'll barely feed it, you shear it back in early spring, and you split the clump every 2 to 3 years before the middle gives out.
Light
Give blue fescue full sun, because that's really what brings out the silver-blue. Stick it in too much shade and it greens up and flops over. It'll put up with light shade, but the foliage isn't as nice.
Water
Once it's established this thing is tough as nails in a dry spell, so water it lightly and let the soil dry out between drinks. It really hates wet, soggy ground, and overwatering is the quickest way to rot the crown, so when in doubt, hold off.
Soil
Plant it in average to lean, sharply drained soil, and don't sweat it if the ground's poor, dry, or rocky. It'll rot in wet or heavy clay, so drainage matters way more than how rich the soil is. Any pH from 5.5 to 7.5 is fine by it.
Temperature
It's seriously cold-hardy, taking winters down to about -29°F (-34°C) and summer heat up to 86°F (30°C). The thing that really wears it out isn't the temperature so much as a hot, humid summer, which can tip it into decline.
Humidity
Low humidity is what it's after, which fits its dry-soil personality. Hot, muggy summers are the rough patch and can make the clump rot or fade, so good airflow and dry roots go a long way.
Feeding
Feeding? Barely bother. One light feeding in spring is plenty, and rich soil actually backfires by giving you floppy, weak growth. Lean ground is exactly where this grass looks its best.
Pruning
Come early spring, shear or comb the clump back to about 3 to 4 inches to clear out the old brown blades before the new growth comes up. That yearly trim is all it takes to keep the tuft looking fresh.
Repotting
Forget repotting; just divide the clump every 2 to 3 years to keep it going strong. When the center turns brown and bare, or the tuft starts thinning, that's your cue to lift and split.
Size & spacing
Each plant stays little, hitting around 8 to 12 inches (20 to 30 cm) tall and about the same across. Space them roughly 10 to 12 inches (25 to 30 cm) apart so each blue dome reads as its own mound.
When to plant
Blue fescue is a cool-season grass, so it does its growing in the milder ends of the year rather than the heat of summer. Pop new plants in during spring once the last frost's gone, or wait for early fall, and keep an eye out for its little flower spikes from late spring into early summer. Early spring is also when you shear and divide.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Late winter to early spring (species only; named blue cultivars do not come true from seed)
- Plant: Spring after last frost or early fall
- Harvest: Late spring to early summer (June-July)
Hardiness
USDA hardiness zones: 4–8
Temperature: down to -34°C
Troubleshooting
Most blue fescue gripes come down to one of two things: too much water or not enough sun. The other near-sure thing is the middle dying out as the plant ages. Find the match below and you can usually sort it with a move, a haircut, or a quick division.
Yellowing, flopping, and a mushy crown
Nine times out of ten it's wet feet. Heavy, rich, or poorly drained soil leads to crown and root rot, and a hot, humid summer can drag a plant down the same way. Move it to lean, sharply drained ground in full sun, back off the water, and trim the tired foliage so it can perk up once things cool off.
Fix:
- Move or replant in sharply well-drained, lean soil with full sun
- Reduce watering and avoid wet feet
- Cut back declining foliage and allow recovery in cooler weather
Bare brown middle with green only around the edge
Don't panic, this is just the plant's short life doing its thing, since blue fescue starts emptying out from the center after 2 to 3 years. A crowded clump that's gone too long without a split gets there faster. Just dig the whole thing up in early spring, chuck the dead middle, and replant the healthy outer chunks.
Fix:
- Dig up the entire clump in early spring
- Discard the dead center and divide the vigorous outer portions into smaller sections
- Replant the divisions in well-drained soil and water in
Blue washing out to plain green
That gorgeous silver-blue is really a sun effect, so a plant in too much shade greens up and gets floppy. Age plays in too, with older clumps drifting greener over summer. Move it into full sun and split any tired clumps, and the bright blue comes right back.
Fix:
- Transplant to a full-sun location
- Divide and replant aging clumps to restore vigor and color
Toxicity
Good news if you've got pets or grazing animals: blue fescue is not toxic. It's a true grass with no poisonous bits, so it's fine around cats, dogs, horses, rabbits, and livestock. Sure, a pet that munches too much might bring it back up like they do with any grass, and the pollen can bug hay fever folks, but nothing here is going to poison anyone.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
No worries with a cat around, since the plant's got nothing harmful in it. If your cat chews a few blades and brings them back up, that's just the usual grass thing, not the plant.
Dogs None
There are no toxins here, so a dog can snuffle around it all it likes. Worst case, a big mouthful of grass comes back up later.
Horses Safe
Horses are totally fine with it. It's a true grass, so grazing on it causes no trouble at all.
Rabbits Safe
Rabbits can browse the fescue without any harm. Actually, rabbits and deer often graze the clumps, which is one reason gardeners like it.
Livestock Safe
It's safe for cattle, goats, and sheep. Fescue's a common pasture grass, and this ornamental kind is no different.
Birds Safe
Nothing in the plant bothers birds, and the seed heads even pull in finches and other little feeders.
People Safe
It's not toxic to people. The only thing to watch is the grass pollen, which can kick off hay fever if you're already sensitive to it.
Not poisonous, but pets that nibble grass may vomit, and grass pollen can aggravate allergies in sensitive people.
Varieties
Most of the blue fescue you'll run into is one of a few named selections, mostly sorted by how blue they are and how well they take the heat. Here are the ones worth knowing.
Elijah Blue
Elijah Blue is the one you'll spot everywhere, loved for its soft, silvery powder-blue blades.
Boulder Blue
Boulder Blue is a fine-textured pick in steely slate-blue that handles heat and drought better than most.
Cool as Ice
Cool as Ice gets chosen for its extra-icy silver-blue, which is about the coolest tone in the bunch.
Beyond Blue
Beyond Blue is a sport of Elijah Blue that holds its blue longer and shrugs off the heat and humidity that wash out the others.
How to propagate
Division is the usual way to get more blue fescue, and the handy part is it also fixes an aging clump at the same time. Seed works fine for the plain species, but it won't give you the named blue selections.
DivisionEasy
Early spring · 4-8 weeks
Division's the way to go, since the named blue cultivars won't come true from seed and splitting an old clump keeps both the color and the shape. Dig and split in early spring, replant the lively outer pieces, and they'll settle in over the next 4 to 8 weeks. Bonus: it's also the cure for a clump that's died out in the middle.
SeedEasy
Late winter to spring · 4-8 weeks
You can grow the plain species from seed sown late winter into spring, and it roots in about 4 to 8 weeks. Just remember the seedlings vary a lot in color and the named cultivars won't come true this way, so seed is best for the species, not a prized blue selection.
Myths
Blue fescue is a plant-once-and-forget grass that lasts for years.
Not quite. It's a short-lived cool-season grass, and the middle of the clump tends to hollow out within 2 to 3 years. To keep it looking good, you've just got to divide it every few years or replace it once it's worn out.