Mature size & growth rate

How big does Tulbaghia (Tulbaghia violacea) get?

Also called society garlic, pink agapanthus, wild garlic.

More about tulbaghia

About Tulbaghia

Tulbaghia violacea · also called society garlic, pink agapanthus · herb

Society garlic is a clump-forming South African perennial with grassy, garlic-scented foliage and long-stemmed umbels of fragrant lilac-pink flowers through summer into autumn. Tough, drought-tolerant and long-flowering, it suits sunny borders, gravel gardens and containers. The leaves are edible with a mild garlic flavour, but the plant contains organosulphur compounds that make it risky for pets.

Mature size: 30-60 cm tall and 25-40 cm wide, slowly clumping.

Indoor size vs how big it gets in the wild

Tulbaghia 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 30-60 cm tall and 25-40 cm wide, slowly clumping.. 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

Tulbaghia 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: feed container plants with a balanced liquid fertiliser monthly through the growing season. border plants need only an annual spring mulch; excess nitrogen favours leaves over flowers.

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

How to keep tulbaghia smaller

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

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

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

When tulbaghia outgrows the room (or the pot)

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

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

Tulbaghia size — frequently asked questions

How big does tulbaghia get?

Tulbaghia reaches 30-60 cm tall and 25-40 cm wide, slowly clumping. 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 tulbaghia slow or fast growing?

Tulbaghia is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Tulbaghia 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 tulbaghia 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 tulbaghia smaller?

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