Repotting guide

When & how to repot Red morning glory (Ipomoea coccinea)

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 — Fungal leaf spots: Cercospora and other fungal leaf spots can appear in humid, wet seasons. Improve air circulation, water at soil level rather than overhead, and remove infected foliage promptly.

How to tell red morning glory needs repotting

Repotting on a calendar is less reliable than reading the plant. For red morning glory, watch for these signs:

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot red morning glory on before it becomes hard root-bound.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot red morning glory

Pot on seedlings as they grow; not a perennial repot. Red morning gloryis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Slender annual twining vine.

What size pot to step red morning glory up to

Pot red morning glory on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot red morning glory

Pot red morning glory on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting red morning glory

Pot on before it is root-bound. Check red morning glory regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
Pot into rich mix. Set it into fresh average to poor, well-draining soil at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water red morning glory in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for red morning glory

Red morning glory wants average to poor, well-draining soil. Unusually tolerant of poor, sandy, or dry soils. Rich fertile soil stimulates excess foliage and reduces flowering. Good drainage is essential; avoid clay or waterlogged positions. pH 6.0–7.0. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting red morning glory — frequently asked questions

How often should you repot red morning glory?

Pot on seedlings as they grow; not a perennial repot for red morning glory. Red morning glory is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into average to poor, well-draining soil so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does red morning glory need?

When is the best time of year to repot red morning glory?

Can you put red morning glory straight into a much bigger pot?

No. Even a fast-growing red morning glory should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise red morning glory after repotting?

Not immediately. Wait about 1 week after repotting red morning glory. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.