Mature size & growth rate

How big does Green Arrow Arum (Peltandra virginica) get?

Also called arrow arum, tuckahoe, Virginia tuckahoe, bog onion.

More about green arrow arum

About Green Arrow Arum

Peltandra virginica · also called arrow arum, tuckahoe · flowering

Green Arrow Arum is a native North American aquatic perennial with bold, glossy arrow-shaped leaves up to 30 cm long. It thrives at pond margins or in shallow water to 20 cm deep, forms dense non-aggressive clumps, and bears greenish-white spathes in late spring. All parts contain calcium oxalate and are toxic if eaten raw.

Mature size: 50–90 cm tall, 45–60 cm spread

Watch for — Clump overgrowth / congestion: Every 3–4 years the rhizome mass fills the basket and flowering declines. Divide in spring before growth resumes, discarding old woody sections and replanting vigorous outer pieces.

Indoor size vs how big it gets in the wild

Green 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 50–90 cm tall, 45–60 cm spread. 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

Green 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 tablet fertiliser into the basket in spring. avoid over-feeding, which promotes algae growth in the pond. no feeding required in nutrient-rich natural pond mud.

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

How to keep green arrow arum smaller

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

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

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

When green arrow arum outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for green 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 green arrow arum repotting guide. If you want more of this plant instead of a bigger one, the green arrow arum propagation guide turns prunings into new plants.

Green Arrow Arum size — frequently asked questions

How big does green arrow arum get?

Green Arrow Arum reaches 50–90 cm tall, 45–60 cm spread 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 green arrow arum slow or fast growing?

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

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