Mature size & growth rate

How big does Calla Lily (Zantedeschia aethiopica) get?

Also called Calla lily, Arum lily, White arum lily, Lily of the Nile, Pig lily, Florist's calla, Trumpet lily.

More about calla lily

About Calla Lily

Zantedeschia aethiopica · also called Calla lily, Arum lily · flowering

The calla lily is a moisture-loving, rhizomatous perennial prized for sculptural white spathes on tall stems. Give it bright indirect light or part shade, consistently damp rich soil, and warmth of 60-80F. Despite the name it is not a true lily but an aroid, and the ASPCA lists it as toxic to dogs and cats.

Mature size: Typically 2-3 ft tall (up to about 3.25 ft / 1 m) and 1-2 ft wide, spreading slowly into clumps by rhizome.

Watch for — Thrips: Banded greenhouse thrips and other thrips cause silvery stippling and distorted growth. Rinse foliage, improve airflow, and treat with insecticidal soap if persistent.

Indoor size vs how big it gets in the wild

Calla Lily 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 typically 2-3 ft tall (up to about 3.25 ft / 1 m) and 1-2 ft wide, spreading slowly into clumps by rhizome.. 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

Calla Lily 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 monthly with a balanced liquid fertiliser (e.g. 10-10-10) diluted through spring and summer while in active growth. a higher-potassium feed encourages flowering. stop feeding once the last bloom fades to let the plant enter dormancy, and resume only when new leaves emerge at the soil line.

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

How to keep calla lily smaller

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

Divide the clump every year or two — splitting calla lily 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 calla lily 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 calla lily bigger or faster

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

When calla lily outgrows the room (or the pot)

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

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

Calla Lily size — frequently asked questions

How big does calla lily get?

Calla Lily reaches typically 2-3 ft tall (up to about 3.25 ft / 1 m) and 1-2 ft wide, spreading slowly into clumps by rhizome. 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 calla lily slow or fast growing?

Calla Lily is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Calla Lily 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 calla lily 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 calla lily smaller?

Divide the clump every year or two — splitting calla lily 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 calla lily 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.