Repotting guide

When & how to repot Carnation of India (Ervatamia coronaria)

Also called Carnation of India, Crepe Jasmine, Pinwheel Flower, East India Rosebay.

More about carnation of india

About Carnation of India

Ervatamia coronaria · also called Carnation of India, Crepe Jasmine · tropical

Ervatamia coronaria (syn. Tabernaemontana coronaria, T. divaricata) is a fragrant tropical shrub from South and Southeast Asia bearing waxy, pinwheel-shaped white flowers with a sweet jasmine-like scent. A staple of tropical gardens and temple offerings, it blooms almost continuously in warm climates. In temperate regions it excels as a conservatory specimen. All parts are toxic.

Mature size: 1.5-2.5 m tall, 1-1.5 m wide in containers; up to 3 m in the ground in tropical climates

Watch for — Failure to flower: Insufficient light is the most common reason. Ensure at least 4-5 hours of bright light daily. Also review nitrogen fertiliser use — excessive nitrogen encourages lush foliage at the expense of flowers. Switching to a phosphorus/potassium-rich formula in summer promotes blooming.

How to tell carnation of india needs repotting

Repotting on a calendar is less reliable than reading the plant. For carnation of india, watch for these signs:

Roots poking out of the drainage holes or coiling visibly around the inside of the pot.
You are watering far more often than you used to because the rootball dries out within a day or two.
Water runs straight through and out the bottom without soaking in.
Top growth has slowed or new carnation of india leaves are noticeably smaller than older ones despite good light.

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 carnation of india

Every 12–18 months — sooner if roots show fast. Carnation of India's growth habit — upright, rounded, branching evergreen shrub — sets the pace. Ervatamia coronaria (syn. Tabernaemontana coronaria, T. divaricata) is a fragrant tropical shrub from South and Southeast Asia bearing waxy, pinwheel-shaped white flowers with a sweet jasmine-like scent. A staple of tropical gardens and temple offerings, it blooms almost continuously in warm climates. In temperate regions it excels as a conservatory specimen. All parts are toxic.

What size pot to step carnation of india up to

Step up one pot size — about 2–3 cm (an inch) wider. Carnation of India grows fast, so it will fill that space within a season, but jumping several sizes at once still backfires: the unused soil stays soggy and rots even a vigorous root system. One size at a time, every year or so, is the rhythm.

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 carnation of india

Early spring, just as new growth restarts, is the ideal window for carnation of india. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting carnation of india

Time it for spring. Repot carnation of india in early spring as growth restarts so it re-roots quickly into the fresh soil.
Choose one size up. Pick a pot about 2–3 cm wider with drainage holes. One step only — a much bigger pot stays soggy and rots roots.
Ease the plant out. Water lightly the day before, then tip carnation of india out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh well-draining, humus-rich, slightly acidic loam in the new pot, set the plant so its soil line is unchanged, and backfill, firming lightly.
Water and pause feeding. Water once to settle the soil. Hold off fertiliser for about a month — fresh mix already has nutrients and feeding now burns new roots.

Aftercare

Water carnation of india once to settle the soil, then let the surface dry before watering again — fresh mix around the roots stays wetter than the old compacted ball, so the commonest post-repot mistake is overwatering. Keep it out of direct sun for a week or two while roots re-establish. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for carnation of india

Carnation of India wants well-draining, humus-rich, slightly acidic loam. A mix of 2 parts peat-free compost, 1 part perlite, and 1 part fine bark creates the ideal balance of moisture retention and free drainage. Target pH 5.5-6.5. Good drainage is critical; compacted, waterlogged soil causes rapid root decline. Repot every 2 years in spring, stepping up one pot size. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting carnation of india — frequently asked questions

How often should you repot carnation of india?

Every 12–18 months — sooner if roots show fast for carnation of india. Repot carnation of india roughly every 12–18 months, in early spring as growth restarts. It grows fast and circles its pot quickly, so step up one size (about 2–3 cm wider) into fresh well-draining, humus-rich, slightly acidic loam. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does carnation of india need?

When is the best time of year to repot carnation of india?

Can you put carnation of india straight into a much bigger pot?

No. Even a fast-growing carnation of india 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 carnation of india after repotting?

Not immediately. Wait about 4 weeks after repotting carnation of india. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.