Mature size & growth rate

How big does Red morning glory (Ipomoea coccinea) get?

Also called Red morning glory, Scarlet creeper, Redstar, Mexican morning glory.

More about red morning glory

About Red morning glory

Ipomoea coccinea · also called Red morning glory, Scarlet creeper · flowering

Red morning glory is a slender, fast-twining annual vine bearing clusters of small scarlet trumpets with yellow throats that attract hummingbirds. Thrives in full sun on poor-to-average soil and tolerates heat and drought once established. Seeds contain indole alkaloids and are toxic to pets. Can reseed aggressively in warm climates.

Mature size: 2–4 m (6–12 ft) in a season

Watch for — Sparse flowering in rich soil: Excess fertility pushes leaf growth at the expense of blooms. This species actually performs better in lean, average soil with minimal fertilising.

Indoor size vs how big it gets in the wild

Red morning glory 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 2–4 m (6–12 ft) in a season. 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

Red morning glory is a moderate grower. Realistically, expect a single growing season — it reaches full size in one year, then is done. Its feeding profile backs this up: apply a low-nitrogen fertiliser (e.g., 5-10-10) once at planting. on poor soils a single midsummer feed may help; over-fertilising depresses bloom production.

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

How to keep red morning glory smaller

You are not stuck with the maximum size. For red morning glory specifically, these are the levers, in order of impact:

Choose a compact or dwarf variety of red morning glory 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 red morning glory bigger or faster

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

When red morning glory outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for red morning glory:

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

Red morning glory size — frequently asked questions

How big does red morning glory get?

Red morning glory reaches 2–4 m (6–12 ft) in a season 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 red morning glory slow or fast growing?

Red morning glory is a moderate grower. Expect a single growing season — it reaches full size in one year, then is done. Red morning glory 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 red morning glory 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 red morning glory smaller?

Choose a compact or dwarf variety of red morning glory 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 red morning glory 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.