Repotting guide

When & how to repot Clematis (Clematis spp.)

Also called Clematis, Leather flower, Virgin's bower, Old man's beard, Traveller's joy.

More about clematis

About Clematis

Clematis spp. · also called Clematis, Leather flower · flowering

Clematis is a deciduous or evergreen flowering climber prized for showy blooms on trellises, walls and fences. It thrives with sun on its foliage and shade on its roots. Important warning: Clematis is toxic to cats, dogs and horses per the ASPCA, so site it away from pets that chew foliage.

Mature size: Highly variable by type. Herbaceous clematis typically reach 75cm-1.5m (2.5-5ft) tall, while most climbing types reach around 3m (10ft); vigorous species such as C. montana can climb 7-12m (20-40ft) or more into trees and over large walls.

Watch for — Clematis wilt: The fungus Calophoma clematidina invades the stems and blocks water-conducting tissue, causing sudden wilting, leaf spotting and blackening of stems near soil level, mainly in large-flowered hybrids.

How to tell clematis needs repotting

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

Every 2–3 years; top-dress in the in-between years. Clematis's growth habit — mostly woody, deciduous climbing vines (some evergreen or herbaceous), climbing without clinging by twining their leaf stalks around supports such as trellises, wires, other plants or shrubs. they do not damage building exteriors. for pruning, clematis fall into three groups based on flowering time and the age of flowering wood: group 1 (early, prune after flowering), group 2 (large-flowered hybrids), and group 3 (late-flowering, hard-prune in late winter/early spring). — sets the pace. Clematis is a deciduous or evergreen flowering climber prized for showy blooms on trellises, walls and fences. It thrives with sun on its foliage and shade on its roots. Important warning: Clematis is toxic to cats, dogs and horses per the ASPCA, so site it away from pets that chew foliage.

What size pot to step clematis up to

Move up exactly one pot size. A heavy clematis 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 clematis

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

Consider top-dressing first. If clematis 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 deep, fertile, moist but well-drained loam 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 clematis in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave clematis 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 clematis

Clematis wants deep, fertile, moist but well-drained loam. Clematis prefer a deep, fertile, moist yet well-drained soil that is neutral to slightly alkaline. On heavy clay or sandy soils, dig in plenty of organic matter such as well-rotted manure or leaf mould before planting. Plant large-flowered hybrids with the rootball 5-7.5cm (2-3in) below the surface to encourage strong shoots and aid recovery from clematis wilt. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting clematis — frequently asked questions

How often should you repot clematis?

Every 2–3 years; top-dress in the in-between years for clematis. Fully repot clematis 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 deep, fertile, moist but well-drained loam. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does clematis need?

When is the best time of year to repot clematis?

Should you top-dress or fully repot clematis?

For a big, heavy clematis, 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 clematis after repotting?

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