Mature size & growth rate

How big does Banana passionflower (Passiflora mollissima) get?

Also called Banana passionflower, Softleaf passionflower, Curuba.

More about banana passionflower

About Banana passionflower

Passiflora mollissima · also called Banana passionflower, Softleaf passionflower · flowering

Banana passionflower is a vigorous Andean climber bearing pendulous, tubular pink flowers and elongated yellow fruit. It thrives in cool subtropical conditions with bright light and moderate humidity. Fast-growing and frost-tender, it needs sturdy support and regular pruning to stay manageable. Excellent for fences and trellises in frost-free gardens.

Mature size: Up to 9 m length

Watch for — Aphids and whitefly: Colonies colonise new growth rapidly; blast off with water or apply insecticidal soap. Ants farming aphids worsen infestations — control ants with sticky barriers.

Indoor size vs how big it gets in the wild

Banana passionflower grows on a tree's timeline and scale — indoors it becomes a tall, trunked statement plant rather than a tabletop one. Indoors and in a pot, expect up to 9 m length. 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 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

Banana passionflower 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: feed with a balanced liquid fertiliser (10-10-10) every 2–3 weeks during spring and summer. switch to a low-nitrogen, high-potassium feed once flower buds form to promote bloom. do not fertilise during winter rest.

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

How to keep banana passionflower smaller

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

The decisive tool is the secateurs: banana passionflower 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 banana passionflower 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 banana passionflower bigger or faster

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

When banana passionflower outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for banana passionflower:

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

Banana passionflower size — frequently asked questions

How big does banana passionflower get?

Banana passionflower reaches up to 9 m length when grown indoors. 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 banana passionflower slow or fast growing?

Banana passionflower is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Banana passionflower grows on a tree's timeline and scale — indoors it becomes a tall, trunked statement plant rather than a tabletop one.

How long does banana passionflower 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 banana passionflower smaller?

The decisive tool is the secateurs: banana passionflower 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 banana passionflower 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.