Mature size & growth rate

How big does Colocasia 'Black Magic' (Colocasia esculenta 'Black Magic') get?

Also called Black Magic elephant ear, Black taro, Black elephant ear, Imperial taro.

More about colocasia 'black magic'

About Colocasia 'Black Magic'

Colocasia esculenta 'Black Magic' · also called Black Magic elephant ear, Black taro · tropical

Colocasia 'Black Magic' is a tuberous tropical grown for its huge heart-shaped, dusky purple-black leaves. It wants bright light, constantly moist to wet soil, warmth, and high humidity, and dies back below freezing. The ASPCA lists Colocasia esculenta as toxic to dogs and cats due to insoluble calcium oxalate crystals, so keep it away from pets.

Mature size: Typically 0.9-1.8 m (3-6 ft) tall and wide, with individual leaves up to about 60 cm (2 ft) long; larger in ideal warm, wet, frost-free conditions.

Watch for — Aphids and whiteflies: Cluster on new growth and leaf undersides, causing distortion and sticky residue. Blast off with water and treat with insecticidal soap, repeating weekly until clear.

Indoor size vs how big it gets in the wild

Colocasia 'Black Magic' is a tree at heart. Indoors a pot and your ceiling keep it to typically 0.9-1.8 m (3-6 ft) tall and wide, with individual leaves up to about 60 cm (2 ft) long, but in the ground it is a different scale of plant entirely (larger in ideal warm, wet, frost-free conditions.). Indoors and in a pot, expect typically 0.9-1.8 m (3-6 ft) tall and wide, with individual leaves up to about 60 cm (2 ft) long. In the ground with no restriction it is a completely different plant — larger in ideal warm, wet, frost-free conditions. — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Growth rate and years to mature

Colocasia 'Black Magic' is a fast grower. Realistically, expect two to four years from a young plant to a room-filling specimen in good light. Its feeding profile backs this up: heavy feeder during active growth. apply a balanced liquid fertiliser every 2-4 weeks through spring and summer, or work a slow-release feed into the soil at planting. stop feeding in autumn and through winter dormancy.

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

How to keep colocasia 'black magic' smaller

You are not stuck with the maximum size. For colocasia 'black magic' specifically, these are the levers, in order of impact:

The decisive tool is the secateurs: colocasia 'black magic' can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape.
Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size.
Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height.
Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

The keep-it-smaller method, step by step

Pick the new height. Decide how tall you want colocasia 'black magic' and find a leaf node or branch point just below that.
Top the main stem. Cut the main growing tip cleanly just above that node in spring; this permanently caps the height and forces side branches.
Keep the pot snug. Avoid jumping to a much bigger pot — a slightly restricted rootball keeps the whole plant smaller.
Maintain the shape. Prune back the tallest new leaders each spring to hold it at the height you chose.

How to grow colocasia 'black magic' bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for colocasia 'black magic' the accelerators are:

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators.
Pot up a size every year or two while young; restricted roots are the main thing holding height back.
Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.

Light is almost always the ceiling. The colocasia 'black magic' light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When colocasia 'black magic' outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for colocasia 'black magic':

The top leaves pressing against or bent by the ceiling — the classic "this is now too tall indoors" sign.
It has to be moved away from a light source it has literally outgrown.
Roots filling the largest pot you can reasonably keep indoors — at that point it is top-or-prune or move it outside (if hardy).

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

Colocasia 'Black Magic' size — frequently asked questions

How big does colocasia 'black magic' get?

Colocasia 'Black Magic' reaches typically 0.9-1.8 m (3-6 ft) tall and wide, with individual leaves up to about 60 cm (2 ft) long when grown indoors, and far larger where it grows unrestricted (larger in ideal warm, wet, frost-free conditions.). It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Is colocasia 'black magic' slow or fast growing?

Colocasia 'Black Magic' is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Colocasia 'Black Magic' is a tree at heart. Indoors a pot and your ceiling keep it to typically 0.9-1.8 m (3-6 ft) tall and wide, with individual leaves up to about 60 cm (2 ft) long, but in the ground it is a different scale of plant entirely (larger in ideal warm, wet, frost-free conditions.).

How long does colocasia 'black magic' take to reach full size?

Roughly two to four years from a young plant to a room-filling specimen in good light. Light, pot size and feeding move that timeline more than anything else.

How do I keep colocasia 'black magic' smaller?

The decisive tool is the secateurs: colocasia 'black magic' can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape. Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size. Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height. Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

How can I make colocasia 'black magic' grow bigger or faster?

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators. Pot up a size every year or two while young; restricted roots are the main thing holding height back. Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.