Ornamental · Poaceae
Big Bluestem
Andropogon gerardii
Offer it full sun and lean soil, and this towering native grass will hold itself tall from summer right through winter.
Full sun
Every 7–21 days
60–90 days
USDA 3–9
Overview
Big bluestem is the grass that once reigned over the tallgrass prairie, and that history is exactly why it picked up the nickname King of the Prairie Grasses. It's a warm-season native that climbs 4 to 8 feet (122 to 244 cm) in just one season, throwing up blue-green stems that warm to copper and red as autumn settles in. At the top, each seed head splits into three fingers, and that telltale shape is the reason people also call it turkeyfoot.
Few plants are as forgiving to begin with, largely because this one asks so little of you. It brushes off drought once its deep roots take hold, it makes peace with clay or sand or thin soil, and it wants no fertilizer whatsoever. Hand it sun and good drainage, and it pretty much looks after itself, which makes it a wonderful choice for anyone just starting out.
There is a free spirit in it, and that's part of the charm. Big bluestem self-seeds and spreads wherever the conditions agree with it, and it grows tall enough to take over a small bed, so it does its best work in meadows, roomy borders, and natural plantings where it can wander a little. Leave it standing through the cold months and the pale stems and seed heads will feed the birds and hold their shape against the snow.
Care
The short version: full sun, lean and well-drained soil, and no fertilizer. Keep it watered while it gets comfortable, then hand the job to the rain, and trim the old growth back just once a year in late winter.
Light
Big bluestem loves full sun, which means 6 or more hours of direct light each day. A little shade won't kill it, but the stems turn weak and tend to flop without strong light, so the more sun you can give it, the more proudly it stands.
Water
Give it regular water only while it's settling in. Once that's done it's drought tolerant and gets by on rainfall in average to dry soil, asking for a drink just every 7 to 21 days during a genuine dry stretch.
Soil
Set it in lean, well-drained ground, anything from dry to medium will do. It takes poor, sandy, or clay soil happily across a pH of 5.0 to 7.5, but rich, moist soil makes it grow soft and flop, so go easy and skip the heavy amendments.
Temperature
This plant has a wide comfort zone, standing up to harsh cold and summer heat alike, handling temperatures from roughly -29°F to 104°F (-34°C to 40°C). It dies back to the ground every winter and sends up fresh growth again once late spring warms.
Humidity
Plain outdoor air is all it needs, so there's no humidity to fuss over. Good airflow counts for far more than any number, since open spacing helps keep the odd bout of leaf rust from taking hold.
Feeding
Skip the feeding altogether. Big bluestem is a native that thrives on poor soil, and any extra richness from fertilizer only encourages weak, leggy stems that topple over.
Pruning
Cut the whole clump back to a few inches in late winter or early spring, before the new growth gets going. Let it stand through the cold months, when the dried stems and seed heads keep their shape and offer something for wildlife.
Repotting
Big bluestem hardly ever needs lifting. If an older clump begins to die out in the center or loses some of its vigor after many years, simply dig it up and divide it in spring to give the planting a fresh start.
Size & spacing
A grown plant will reach 4 to 8 feet (122 to 244 cm) tall on a base of 2 to 3 feet (61 to 91 cm). Allow it that full footprint so air can move freely and the clump can stand tall without leaning on its neighbors.
When to plant
Big bluestem lives for summer heat and rests through the cold. You can start seed indoors in late winter after a cold-moist chill, set young plants out once the frost has gone in spring, or scatter seed dormant across fall and winter, whichever fits your year. The purplish turkey-foot heads come along from late summer into fall.
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, 8-10 weeks before last frost (cold-moist stratify seed)
- Plant: Spring after last frost, or dormant-seed in fall/winter
- Harvest: Late summer to fall (purplish turkey-foot seed heads)
Hardiness
USDA hardiness zones: 3–9
Temperature: down to -40°C
Troubleshooting
For a grass this tough, big bluestem brings only a handful of troubles, and most of them come down to too much shade or too rich a spot. Catch the early hints on the stems and leaves and the answer is usually a simple one. Find what matches below, then step in before it shapes the look of the whole clump, and you'll have it back on track in no time.
Stems lean over and the clump pulls apart down the middle
If your big bluestem is flopping, take heart, because the cause is nearly always too little sun or too much feeding, and both are easy to undo. Stems that grow in shade or in rich ground turn soft and tall and lose the strength to stay upright. Give it a sunnier spot, hold back on any fertilizer, and cut it down hard in late winter so the fresh stems come up firm. If you want certainty, an upright pick like 'Blackhawks' keeps things standing.
Fix:
- Site in full sun
- Stop fertilizing and avoid rich amendments
- Cut back hard in late winter so sturdy new growth emerges
- Choose an upright cultivar such as 'Blackhawks' if flopping persists
Fresh seedlings appear and the clump drifts past its spot
Big bluestem self-seeds freely and creeps slowly outward on short rhizomes, and it does this most happily in sunny, fertile, moist ground. Don't worry, since you stay in charge: snip and clear away the seed heads before they ripen and the spreading stops there. When spring comes you can also lift and divide the clump, then gently pull or relocate any volunteers you'd rather not keep.
Fix:
- Cut and remove seed heads before they mature to limit self-seeding
- Divide and reduce the clump in spring
- Pull or transplant volunteer seedlings
A hefty clump that overruns a small bed and its neighbors
Remember that this is a tallgrass-prairie giant by nature, rising 4 to 8 feet (122 to 244 cm) on a 2 to 3 foot (61 to 91 cm) base, so it naturally towers over anything tucked in beside it. The kind thing is to give it open room as a backdrop or screen, or to shift it where it can spread out freely. If you'd sooner leave it put, dividing the clump brings its footprint back down to size.
Fix:
- Relocate to a larger space or use as a backdrop/screen
- Divide to reduce footprint
Orange, rusty flecks dotted over the leaves
Those little raised orange spots are rust, a fungus that shows up here and there but seldom causes any lasting trouble, so there's no need to panic. Open the clump up for better airflow, pull off any leaves that are heavily marked, and cut the whole plant back in late winter to sweep away the spores that wait out the cold. Beyond this, the grass has no real pests worth worrying over.
Fix:
- Improve air circulation
- Remove and dispose of heavily affected foliage
- Cut back in late winter to remove overwintering inoculum
Toxicity
Big bluestem is safe all around, which is a comfort to anyone with pets or little ones nearby. It's a native prairie grass with no poisonous parts, it appears on no ASPCA toxic-plant list, and it's actually valued as livestock forage. The one thing to keep an eye on is the pollen, which can stir up hay fever in people who already react to grasses.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
You can relax around cats. One that chews a blade or two may cough it back up, just as cats do with any grass, but there is nothing poisonous in the plant.
Dogs None
Nothing to fret about with dogs. The grass carries no toxins, so a dog can sniff at it or nibble a bit and come to no harm.
Horses None
Completely safe for horses. They graze big bluestem willingly, and it stands among the finer native pasture grasses you can offer them.
Rabbits None
Rabbits can graze it without concern. It's an ordinary grass with no poisonous parts to it.
Livestock None
Valued as feed rather than feared as a hazard. Cattle, goats, and sheep all browse it, and it rates as top-quality grazing right across the prairie.
Birds None
Gentle on birds, which eat the seed and tuck into the standing clumps for shelter through the winter.
People None
Safe to touch or stand near. The single thing to keep in mind is the pollen, which can bring on hay fever in anyone who already reacts to grasses.
Grass pollen can trigger seasonal hay-fever allergies in sensitive people, and pets that nibble grass may occasionally vomit, but the plant is not poisonous.
Varieties
Most big bluestem grown for the garden is chosen either for its fall color or for a sturdier, more upright stance. Here are the named selections worth getting to know.
Blackhawks
An upright, flop-resistant choice whose dark green spring foliage turns nearly black by autumn, and it was named Perennial Plant of the Year for 2026.
Red October
Selected for its autumn display, when the leaves shift to a striking red and red-purple.
Indian Warrior
Favored for the deep red-purple shades it puts on once fall arrives.
Dancing Wind
Notable for the colorful red-tinged leaves it keeps as the season turns to fall.
Andropogon hallii (sand bluestem)
A near relative suited to dry, sandy ground that closely resembles big bluestem itself.
Companions
Big bluestem pairs naturally with the other tallgrass-prairie plants it grew up alongside, grasses and sun-loving forbs that share its taste for full sun and well-drained ground.
Plant near
Switchgrass (Panicum virgatum): Companion warm-season prairie grass often planted together for forage and naturalistic plantings.
Indiangrass (Sorghastrum nutans): Co-dominant tallgrass-prairie grass with matching site needs for meadow and restoration plantings.
Purple coneflower (Echinacea purpurea): Full-sun prairie forb that pairs well with big bluestem in native borders and meadows.
How to propagate
You can grow big bluestem from seed or split a clump you already have, and either path is an easy one to follow once you get a feel for its rhythm.
SeedEasy
Spring sowing, or dormant fall/winter seeding; cold-moist stratify for best germination · Somewhat slow to establish (1-2 seasons), then vigorous
Most gardeners begin with seed, either sown in spring or scattered dormant across fall and winter, giving it a cold-moist chill first to coax the seed awake. The seedlings rise up healthy, and while the stand wants a season or two to find its feet, that patience pays off. From there it carries on by itself, self-seeding freely anywhere the conditions please it.
DivisionEasy
Spring as new growth begins · One growing season
When you want quick new plants or simply a smaller clump, dig up an established one and split it just as the growth wakes in spring. The pieces settle their roots and fill in over a single season, so it's a forgiving way to multiply.
Myths
Big bluestem and little bluestem are the same plant.
These are two separate grasses from two separate genera. Big bluestem, Andropogon gerardii, reaches up to 4 to 8 feet (122 to 244 cm) and bears the three-pronged turkey-foot seed head behind its name. Little bluestem, Schizachyrium scoparium, belongs to its own genus and tops out at a modest 1 to 3 feet tall. The names are close cousins, but the plants cannot stand in for each other.