Repotting guide

When & how to repot White dipladenia (Mandevilla boliviensis)

Also called White dipladenia, White mandevilla, White rocktrumpet.

More about white dipladenia

About White dipladenia

Mandevilla boliviensis · also called White dipladenia, White mandevilla · tropical

A twining tropical climber from Bolivia bearing large, funnel-shaped white flowers with bright orange-yellow throats against glossy dark foliage. Grown outdoors in frost-free climates (USDA 10–11) or as a patio container plant elsewhere, it flowers prolifically in full sun from late spring through autumn and appreciates consistently moist, well-drained soil.

Mature size: 2.5–4 m tall, 1–1.5 m spread (8–13 ft × 3–5 ft)

How to tell white dipladenia needs repotting

Repotting on a calendar is less reliable than reading the plant. For white dipladenia, watch for these signs:

Thick roots out of the drainage holes, or circling the surface and lifting the plant.
The pot dries out unusually fast and white dipladenia wilts between waterings it used to shrug off.
The plant is visibly top-heavy and tips over easily.
Stalled growth and small new leaves over a full season — though with a big specimen, top-dressing is often the better first response before a full repot.

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 white dipladenia

Every 2–3 years; top-dress in the in-between years. White dipladenia's growth habit — twining woody climber — sets the pace. A twining tropical climber from Bolivia bearing large, funnel-shaped white flowers with bright orange-yellow throats against glossy dark foliage. Grown outdoors in frost-free climates (USDA 10–11) or as a patio container plant elsewhere, it flowers prolifically in full sun from late spring through autumn and appreciates consistently moist, well-drained soil.

What size pot to step white dipladenia up to

Move up exactly one pot size. A heavy white dipladenia dropped into a vastly bigger pot sits in a reservoir of wet soil its roots cannot reach, which rots them and destabilises the plant. In the years between repots, lift off and replace the top 3–5 cm of soil (top-dressing) instead — it refreshes nutrients without the shock of a full repot.

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 white dipladenia

Early spring, just as new growth restarts, is the ideal window for white dipladenia. 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 white dipladenia

Consider top-dressing first. If white dipladenia is not badly root-bound, scrape off and replace the top 3–5 cm of soil instead — far less shock for a big plant that hates moving.
Get help and one size up. For a full repot, choose a pot just one size larger. A heavy plant needs two people and a stable, free-draining pot.
Ease it out on its side. Lay the plant down, slide the pot off, and gently loosen the outer roots. Do not bare-root a mature specimen.
Repot at the same depth. Add fresh moist, well-drained loam with high organic matter beneath and around the rootball, keeping the original soil line. Firm it so the trunk is stable and upright.
Water and leave it put. Water thoroughly, then leave white dipladenia in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave white dipladenia in exactly the same spot and light it was in before — moving and repotting at the same time is what makes a big specimen drop leaves. Water it in well, then let the top of the soil dry before watering again so the larger volume of fresh soil does not stay sodden. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for white dipladenia

White dipladenia wants moist, well-drained loam with high organic matter. Use a loam-based, peat-free compost with added perlite for container growing. Tolerates slightly acid to alkaline pH (5.5–7.5). Avoid heavy, compacted soils that hold standing water. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting white dipladenia — frequently asked questions

How often should you repot white dipladenia?

Every 2–3 years; top-dress in the in-between years for white dipladenia. Fully repot white dipladenia only every 2–3 years; in the in-between years just top-dress the top 3–5 cm of soil. Step up one pot size in spring with moist, well-drained loam with high organic matter. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does white dipladenia need?

When is the best time of year to repot white dipladenia?

Should you top-dress or fully repot white dipladenia?

For a big, heavy white dipladenia, top-dressing — replacing the top 3–5 cm of soil — is the gentler option most years, with a full repot only every 2–3 years. A mature specimen sulks and drops leaves when fully repotted, so do it as rarely as the roots allow.

Should you fertilise white dipladenia after repotting?

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