Repotting guide

When & how to repot Pinwheel Flower (Tabernaemontana divaricata)

Also called Pinwheel Flower, Crape Jasmine, East Indian Rosebay, Nero's Crown.

More about pinwheel flower

About Pinwheel Flower

Tabernaemontana divaricata · also called Pinwheel Flower, Crape Jasmine · tropical

A fragrant evergreen shrub from South and Southeast Asia bearing pure-white, pinwheel-shaped blooms almost year-round. Thrives in bright indirect to part-sun conditions with consistently moist, well-drained soil. Makes an outstanding container plant indoors in cooler climates. Highly scented, especially at night.

Mature size: 1.5–3 m tall (5–10 ft) and 1.2–2.4 m wide outdoors; easily maintained smaller in containers

Watch for — Chlorosis (yellowing leaves): Often caused by iron or manganese deficiency in alkaline soils. Acidify with a chelated iron drench and maintain soil pH near 6.0–6.5. May also indicate overwatering or waterlogged roots.

How to tell pinwheel flower needs repotting

Repotting on a calendar is less reliable than reading the plant. For pinwheel flower, 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 pinwheel flower 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 pinwheel flower

Every 12–18 months — sooner if roots show fast. Pinwheel Flower's growth habit — upright, multi-stemmed evergreen shrub with a rounded, bushy crown — sets the pace. A fragrant evergreen shrub from South and Southeast Asia bearing pure-white, pinwheel-shaped blooms almost year-round. Thrives in bright indirect to part-sun conditions with consistently moist, well-drained soil. Makes an outstanding container plant indoors in cooler climates. Highly scented, especially at night.

What size pot to step pinwheel flower up to

Step up one pot size — about 2–3 cm (an inch) wider. Pinwheel Flower 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 pinwheel flower

Early spring, just as new growth restarts, is the ideal window for pinwheel flower. 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 pinwheel flower

Time it for spring. Repot pinwheel flower 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 pinwheel flower out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh fertile, well-draining loam or all-purpose potting mix 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 pinwheel flower 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 pinwheel flower

Pinwheel Flower wants fertile, well-draining loam or all-purpose potting mix. Tolerates a range of soil types including slightly acidic to mildly alkaline, but insists on good drainage. Amend heavy clay with perlite or coarse sand. A slightly acidic pH (6.0–7.0) supports best flowering and leaf colour. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting pinwheel flower — frequently asked questions

How often should you repot pinwheel flower?

Every 12–18 months — sooner if roots show fast for pinwheel flower. Repot pinwheel flower 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 fertile, well-draining loam or all-purpose potting mix. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does pinwheel flower need?

When is the best time of year to repot pinwheel flower?

Can you put pinwheel flower straight into a much bigger pot?

No. Even a fast-growing pinwheel flower 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 pinwheel flower after repotting?

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