Mature size & growth rate

How big does Camas (Camassia quamash) get?

Also called Camas, Quamash, Common Camas, Blue Camas.

More about camas

About Camas

Camassia quamash · also called Camas, Quamash · flowering

A native North American bulb bearing tall spikes of violet-blue to deep blue star-shaped flowers in late spring. Historically a vital food source for many Indigenous peoples of the Pacific Northwest. Thrives in moist meadow soils and naturalises well in borders and prairies. Deer and rodent resistant. Hardy to zone 3. Not toxic to pets.

Mature size: 40–80 cm tall (16–32 in); clumps spread to 20–30 cm (8–12 in) wide and slowly naturalise into larger drifts

Watch for — Dry soil during spring growth: Drought stress during the growing season results in stunted flower spikes or failure to bloom. Plant in moisture-retentive soil and mulch well. If spring is dry, supplement with irrigation during the active growth period.

Indoor size vs how big it gets in the wild

Camas 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 40–80 cm tall (16–32 in). In the ground with no restriction it is a completely different plant — clumps spread to 20–30 cm (8–12 in) wide and slowly naturalise into larger drifts — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

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

Camas is a moderate grower. Realistically, expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Its feeding profile backs this up: generally not required in fertile garden soils. in poor soils, apply a balanced bulb fertiliser at planting in autumn and a light liquid feed in early spring as leaves emerge. over-feeding is unnecessary and not recommended.

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

How to keep camas smaller

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

Divide the clump every year or two — splitting camas 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 camas 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 camas bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for camas 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 camas light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When camas outgrows the room (or the pot)

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

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 camas repotting guide. If you want more of this plant instead of a bigger one, the camas propagation guide turns prunings into new plants.

Camas size — frequently asked questions

How big does camas get?

Camas reaches 40–80 cm tall (16–32 in) when grown indoors, and far larger where it grows unrestricted (clumps spread to 20–30 cm (8–12 in) wide and slowly naturalise into larger drifts). 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 camas slow or fast growing?

Camas is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Camas 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 camas take to reach full size?

Roughly three to six years to reach mature indoor size, gaining a steady amount each growing season. Light, pot size and feeding move that timeline more than anything else.

How do I keep camas smaller?

Divide the clump every year or two — splitting camas 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 camas 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.