Mature size & growth rate

How big does Aztec Lily (Sprekelia formosissima) get?

Also called Aztec lily, Jacobean lily, Maltese cross lily.

More about aztec lily

About Aztec Lily

Sprekelia formosissima · also called Aztec lily, Jacobean lily · flowering

Sprekelia formosissima is a striking bulbous perennial from Mexico and Guatemala, producing large, deep crimson, orchid-like flowers on bare stems in spring or early summer before the strap-like foliage fully develops. It demands full sun, excellent drainage, and a dry rest period after foliage dies back in autumn to set flower buds for the following season. In the UK it is best kept in a frost-free glasshouse or as a conservatory pot plant; in the US it can be grown outdoors year-round in zones 8–11. All parts of this plant are toxic to cats and dogs.

Mature size: 30–50 cm tall in flower, 20–30 cm spread

Indoor size vs how big it gets in the wild

Aztec Lily grows into a room-scaled plant of roughly 30–50 cm tall in flower, 20–30 cm spread — bigger than a tabletop plant, but not a tree. Indoors and in a pot, expect 30–50 cm tall in flower, 20–30 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.

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

Aztec 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 every two weeks with a balanced liquid fertiliser from leaf emergence until flowering; switch to a high-potassium feed after flowers fade to build up the bulb, then stop as leaves yellow.

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

How to keep aztec lily smaller

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

Prune the tallest or longest growth back to a node to hold aztec 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 aztec lily bigger or faster

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

When aztec lily outgrows the room (or the pot)

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

Aztec Lily size — frequently asked questions

How big does aztec lily get?

Aztec Lily reaches 30–50 cm tall in flower, 20–30 cm spread when grown indoors. It builds steadily in both height and spread to a medium, manageable size, filling a pot and a corner over a few years.

Is aztec lily slow or fast growing?

Aztec Lily is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Aztec Lily grows into a room-scaled plant of roughly 30–50 cm tall in flower, 20–30 cm spread — bigger than a tabletop plant, but not a tree.

How long does aztec 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 aztec lily smaller?

Prune the tallest or longest growth back to a node to hold aztec 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 aztec 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.