Mature size & growth rate

How big does Cobaea scandens (Cobaea scandens) get?

Also called cup and saucer vine, cathedral bells, Mexican ivy.

More about cobaea scandens

About Cobaea scandens

Cobaea scandens · also called cup and saucer vine, cathedral bells · flowering

Cobaea scandens, the cup and saucer vine, is a fast, tender perennial climber usually grown as an annual for its large bell-shaped flowers that open creamy-green and age to deep purple, each set in a leafy green ruff. It climbs rapidly by branched tendrils, flowers from summer to first frost, and quickly covers trellis, arches or fences in a single season.

Mature size: Up to 4-6 m in a single season, scrambling over arches, trellis and fences.

Watch for — Slow, erratic germination: The flat seeds can rot if sown too wet. Sow on edge in spring under warmth, keep barely moist, and be patient as germination is uneven.

Indoor size vs how big it gets in the wild

Cobaea scandens reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back. Indoors and in a pot, expect up to 4-6 m in a single season, scrambling over arches, trellis and fences.. 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 sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Growth rate and years to mature

Cobaea scandens is a fast grower. Realistically, expect a single growing season — it reaches full size in one year, then is done. Its feeding profile backs this up: feed sparingly; too much nitrogen gives leaves not flowers. a high-potash feed such as tomato food every two to three weeks once flowering starts keeps blooms coming without excess foliage.

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

How to keep cobaea scandens smaller

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

Choose a compact or dwarf variety of cobaea scandens from the start — that is the most reliable size control for an annual.
Grow it in a smaller container to naturally limit how large it gets.
For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier.
Sow a little later or space plants closer if you specifically want smaller individual plants.

How to grow cobaea scandens bigger or faster

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

Full sun, warm soil and steady water are what drive a crop to full size fastest.
Sow at the right time for your zone so it gets the whole season to size up.
Feed appropriately for the crop and never let it check (stall) from drought or cold.

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

When cobaea scandens outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for cobaea scandens:

It sprawls beyond its bed or container before harvest — usually a spacing or support issue.
It flops or needs staking once it hits full height.
Once it has fruited or bolted, it is at its final size for good — the next plant is a new sowing.

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

Cobaea scandens size — frequently asked questions

How big does cobaea scandens get?

Cobaea scandens reaches up to 4-6 m in a single season, scrambling over arches, trellis and fences. when grown indoors. It sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Is cobaea scandens slow or fast growing?

Cobaea scandens is a fast grower. Expect a single growing season — it reaches full size in one year, then is done. Cobaea scandens reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back.

How long does cobaea scandens take to reach full size?

Roughly a single growing season — it reaches full size in one year, then is done. Light, pot size and feeding move that timeline more than anything else.

How do I keep cobaea scandens smaller?

Choose a compact or dwarf variety of cobaea scandens from the start — that is the most reliable size control for an annual. Grow it in a smaller container to naturally limit how large it gets. For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier. Sow a little later or space plants closer if you specifically want smaller individual plants.

How can I make cobaea scandens grow bigger or faster?

Full sun, warm soil and steady water are what drive a crop to full size fastest. Sow at the right time for your zone so it gets the whole season to size up. Feed appropriately for the crop and never let it check (stall) from drought or cold.