Mature size & growth rate

How big does Arrow Arum (Peltandra virginica) get?

Also called Arrow Arum, Green Arrow Arum, Tuckahoe, Virginia Peltandra.

More about arrow arum

About Arrow Arum

Peltandra virginica · also called Arrow Arum, Green Arrow Arum · flowering

Peltandra virginica is a robust aquatic and emergent wetland perennial native to swamps, marshes, and slow-moving streams along the eastern coast of North America. It thrives in shallow standing water or permanently waterlogged boggy soil in full sun to part shade, producing distinctive glossy, arrow-shaped leaves up to 45 cm long and a green-spathed flower spike followed by green berry clusters. The single most important care fact is providing permanent wet feet — it must grow in consistently flooded or saturated soil. This plant is toxic to cats and dogs due to calcium oxalate crystals in all plant parts.

Mature size: 60–90 cm (2–3 ft) tall above water, spreading to 60–90 cm (2–3 ft) wide.

Watch for — Aphid Colonies on New Growth: Aphids frequently colonise the unfurling young leaves and flower spathes in spring; remove by hand or apply insecticidal soap, avoiding contamination of pond water with chemical treatments.

Indoor size vs how big it gets in the wild

Arrow Arum 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 60–90 cm (2–3 ft) tall above water, spreading to 60–90 cm (2–3 ft) wide.. 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

Arrow Arum 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: apply a slow-release aquatic fertiliser tablet pushed into the root zone once in spring; avoid releasing excess nutrients into the water column which can cause algal blooms.

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

How to keep arrow arum smaller

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

Divide the clump every year or two — splitting arrow arum 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 arrow arum 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 arrow arum bigger or faster

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

When arrow arum outgrows the room (or the pot)

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

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

Arrow Arum size — frequently asked questions

How big does arrow arum get?

Arrow Arum reaches 60–90 cm (2–3 ft) tall above water, spreading to 60–90 cm (2–3 ft) wide. 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 arrow arum slow or fast growing?

Arrow Arum is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Arrow Arum 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 arrow arum 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 arrow arum smaller?

Divide the clump every year or two — splitting arrow arum 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 arrow arum 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.