Mature size & growth rate

How big does Blue Water Lily (Nymphaea colorata) get?

Also called African Blue Water Lily, Tropical Blue Lily.

More about blue water lily

About Blue Water Lily

Nymphaea colorata · also called African Blue Water Lily, Tropical Blue Lily · tropical

Blue Water Lily is a tropical African species producing delicate lilac-blue flowers above rounded floating pads. Unlike hardy species, it requires warm water year-round and is typically grown as an annual in temperate climates or overwintered indoors. Nymphaea is listed by the ASPCA as toxic to cats and dogs and should be kept away from pets.

Mature size: Spread 60-120 cm; flowers 5-8 cm across

Watch for — Cold water shock: Water temperatures below 18°C stunt growth and prevent flowering. Do not place outdoor until water has warmed in late spring.

Indoor size vs how big it gets in the wild

Blue Water Lily grows into a room-scaled plant of roughly spread 60-120 cm — bigger than a tabletop plant, but not a tree. Indoors and in a pot, expect spread 60-120 cm. In the ground with no restriction it is a completely different plant — flowers 5-8 cm across — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

It builds steadily in both height and spread to a medium, manageable size, filling a pot and a corner over a few years.

Growth rate and years to mature

Blue Water 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 with aquatic fertiliser tablets every 3-4 weeks during the active growing season. tropical water lilies are heavy feeders compared to hardy types and benefit from consistent fertilising to maintain continuous bloom cycles.

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

How to keep blue water lily smaller

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

Prune the tallest or longest growth back to a node to hold blue water lily at the size you want.
Keep it slightly pot-bound and feed sparingly to cap the overall size.
Remove the largest or oldest leaves to keep the footprint in check.

How to grow blue water lily bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for blue water lily the accelerators are:

It already has good light; a yearly pot-up plus spring-summer feeding drives the fastest growth.
Pot up a size every year or two while it is establishing.
Feed and water consistently through the growing season for steady, faster size gain.

Light is almost always the ceiling. The blue water lily light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When blue water lily outgrows the room (or the pot)

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

It crowds the shelf or corner it lives in and starts leaning for light.
Roots circling the pot base or escaping the drainage holes.
It needs a noticeably bigger pot every year — a sign to pot up, divide, or prune.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the blue water lily repotting guide. If you want more of this plant instead of a bigger one, the blue water lily propagation guide turns prunings into new plants.

Blue Water Lily size — frequently asked questions

How big does blue water lily get?

Blue Water Lily reaches spread 60-120 cm when grown indoors, and far larger where it grows unrestricted (flowers 5-8 cm across). It builds steadily in both height and spread to a medium, manageable size, filling a pot and a corner over a few years.

Is blue water lily slow or fast growing?

Blue Water Lily is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Blue Water Lily grows into a room-scaled plant of roughly spread 60-120 cm — bigger than a tabletop plant, but not a tree.

How long does blue water 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 blue water lily smaller?

Prune the tallest or longest growth back to a node to hold blue water lily at the size you want. Keep it slightly pot-bound and feed sparingly to cap the overall size. Remove the largest or oldest leaves to keep the footprint in check.

How can I make blue water lily grow bigger or faster?

It already has good light; a yearly pot-up plus spring-summer feeding drives the fastest growth. Pot up a size every year or two while it is establishing. Feed and water consistently through the growing season for steady, faster size gain.