Mature size & growth rate

How big does Blue Pickerelweed (Pontederia azurea) get?

Also called Blue Pickerelweed, Anchored Water Hyacinth, Azure Pickerelweed.

More about blue pickerelweed

About Blue Pickerelweed

Pontederia azurea · also called Blue Pickerelweed, Anchored Water Hyacinth · flowering

Pontederia azurea is a rooted, emergent aquatic perennial from South America bearing vivid blue-violet flower spikes above broad, heart-shaped leaves from summer into autumn. Unlike the free-floating common water hyacinth, it anchors in shallow water or wet margins. A striking pond marginal plant valued for its intense flower colour and long bloom season; less aggressively invasive than P. crassipes.

Mature size: Clump 60–90 cm (24–36 in) tall in flower; spread 40–60 cm (16–24 in). Suitable for medium to large ponds and water features. Can be grown in a 20–30 cm diameter aquatic basket on a pond shelf.

Watch for — Slug and snail grazing on new growth: Emerging stems and young leaves are susceptible to slug damage, especially in spring. Use wildlife-safe slug controls around the pond margin; avoid metaldehyde-based products near water systems.

Indoor size vs how big it gets in the wild

Blue Pickerelweed 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 clump 60–90 cm (24–36 in) tall in flower. In the ground with no restriction it is a completely different plant — spread 40–60 cm (16–24 in). suitable for medium to large ponds and water features. can be grown in a 20–30 cm diameter aquatic basket on a pond shelf. — 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

Blue Pickerelweed 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 aquatic fertiliser tablets into the compost monthly during the growing season (spring through early autumn). a moderately heavy feeder when growing actively; consistent fertilising promotes a longer and more prolific bloom period.

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

How to keep blue pickerelweed smaller

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

Divide the clump every year or two — splitting blue pickerelweed 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 blue pickerelweed 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 blue pickerelweed bigger or faster

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

When blue pickerelweed outgrows the room (or the pot)

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

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

Blue Pickerelweed size — frequently asked questions

How big does blue pickerelweed get?

Blue Pickerelweed reaches clump 60–90 cm (24–36 in) tall in flower when grown indoors, and far larger where it grows unrestricted (spread 40–60 cm (16–24 in). suitable for medium to large ponds and water features. can be grown in a 20–30 cm diameter aquatic basket on a pond shelf.). 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 blue pickerelweed slow or fast growing?

Blue Pickerelweed is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Blue Pickerelweed 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 blue pickerelweed 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 blue pickerelweed smaller?

Divide the clump every year or two — splitting blue pickerelweed 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 blue pickerelweed 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.