Mature size & growth rate

How big does Broomsedge Bluestem (Andropogon virginicus) get?

Also called Broomsedge Bluestem, Broomsedge, Virginia Bluestem.

More about broomsedge bluestem

About Broomsedge Bluestem

Andropogon virginicus · also called Broomsedge Bluestem, Broomsedge · flowering

Broomsedge Bluestem is a native warm-season bunch grass of eastern North America, instantly recognised by its intense copper-orange to reddish-brown winter colour, which persists well into spring. It colonises old fields, roadsides, and disturbed land, making it a key species in meadow restoration. Though vigorous and sometimes weedy, it provides exceptional winter structure and wildlife habitat.

Mature size: 60–120 cm tall (2–4 ft), 30–60 cm wide (1–2 ft)

Watch for — Mistaken for a dead plant in winter: The vivid orange-copper winter colouration is an ornamental feature, but new gardeners may mistake the dormant clumps for dead material and remove them. Leave clumps standing through winter; cut to the ground in late winter before new growth begins.

Indoor size vs how big it gets in the wild

Broomsedge Bluestem stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward. Indoors and in a pot, expect 60–120 cm tall (2–4 ft), 30–60 cm wide (1–2 ft). A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Growth rate and years to mature

Broomsedge Bluestem is a fast grower. Realistically, expect two to four years from a young plant to a room-filling specimen in good light. Its feeding profile backs this up: do not fertilise. broomsedge is specifically adapted to infertile soils and becomes more aggressive and weedy if nutrients are added. in nutrient-enriched soils it may be outcompeted by more vigorous species, losing its niche advantage.

Want this turned into the right next pot at the right moment? The pot size calculator and the broomsedge bluestem repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast broomsedge bluestem grows.

How to keep broomsedge bluestem smaller

You are not stuck with the maximum size. For broomsedge bluestem specifically, these are the levers, in order of impact:

Divide the clump every year or two — splitting broomsedge bluestem is the main way to control its spread and refresh it.
Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump.
Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

The keep-it-smaller method, step by step

Lift the whole plant. Slide broomsedge bluestem out of its pot in spring when the clump has filled it.
Split the clump. Tease or cut the rootball into two or more sections, each with healthy roots and growth.
Repot one division. Put a single division back in the original pot to reset it to a smaller size; pot or give away the rest.
Remove offsets as they form. Through the year, detach new runners or pups to stop it spreading again.

How to grow broomsedge bluestem bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for broomsedge bluestem the accelerators are:

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger.
Good light plus regular feeding maximises offset and runner production.
Leave plantlets and offsets attached and feed through the growing season for the fastest spread.

Light is almost always the ceiling. The broomsedge bluestem light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When broomsedge bluestem outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for broomsedge bluestem:

The clump bulging over the pot rim or splitting the pot — the cue to divide, not to find a bigger room.
A dense centre that goes bare or tired while the edges keep spreading.
Runners or offsets escaping across the shelf or into neighbouring pots.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the broomsedge bluestem repotting guide. If you want more of this plant instead of a bigger one, the broomsedge bluestem propagation guide turns prunings into new plants.

Broomsedge Bluestem size — frequently asked questions

How big does broomsedge bluestem get?

Broomsedge Bluestem reaches 60–120 cm tall (2–4 ft), 30–60 cm wide (1–2 ft) when grown indoors. Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Is broomsedge bluestem slow or fast growing?

Broomsedge Bluestem is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Broomsedge Bluestem stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward.

How long does broomsedge bluestem take to reach full size?

Roughly two to four years from a young plant to a room-filling specimen in good light. Light, pot size and feeding move that timeline more than anything else.

How do I keep broomsedge bluestem smaller?

Divide the clump every year or two — splitting broomsedge bluestem is the main way to control its spread and refresh it. Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump. Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

How can I make broomsedge bluestem grow bigger or faster?

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger. Good light plus regular feeding maximises offset and runner production. Leave plantlets and offsets attached and feed through the growing season for the fastest spread.