Repotting guide

When & how to repot Cotinus coggygria 'Grace' (Cotinus coggygria 'Grace')

Also called Grace smoke bush, Grace smoke tree.

More about cotinus coggygria 'grace'

About Cotinus coggygria 'Grace'

Cotinus coggygria 'Grace' · also called Grace smoke bush, Grace smoke tree · flowering

'Grace' is a large, vigorous smoke bush prized for its translucent wine-red foliage that flames to scarlet and orange in autumn. Huge, airy plumes of tiny pinkish flowers create the signature 'smoke' in summer. Grow it in full sun on poor, free-draining soil; on lean ground the leaf colour is at its richest and the habit stays dense.

Mature size: 4-5 m tall and 4-5 m wide (13-16 ft) if left unpruned; kept to 1.5-2 m by coppicing.

How to tell cotinus coggygria 'grace' needs repotting

Repotting on a calendar is less reliable than reading the plant. For cotinus coggygria 'grace', 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 cotinus coggygria 'grace' 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 cotinus coggygria 'grace'

Every 2–3 years; top-dress in the in-between years. Cotinus coggygria 'Grace''s growth habit — large, rounded, multi-stemmed deciduous shrub or small tree with an open, spreading crown; can be coppiced hard for larger leaves and a shrubbier shape. — sets the pace. 'Grace' is a large, vigorous smoke bush prized for its translucent wine-red foliage that flames to scarlet and orange in autumn. Huge, airy plumes of tiny pinkish flowers create the signature 'smoke' in summer. Grow it in full sun on poor, free-draining soil; on lean ground the leaf colour is at its richest and the habit stays dense.

What size pot to step cotinus coggygria 'grace' up to

Move up exactly one pot size. A heavy cotinus coggygria 'grace' 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 cotinus coggygria 'grace'

Early spring, just as new growth restarts, is the ideal window for cotinus coggygria 'grace'. 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 cotinus coggygria 'grace'

Consider top-dressing first. If cotinus coggygria 'grace' 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 poor to moderate, sharply drained soil; tolerates chalk and dry ground 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 cotinus coggygria 'grace' in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave cotinus coggygria 'grace' 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 cotinus coggygria 'grace'

Cotinus coggygria 'Grace' wants poor to moderate, sharply drained soil; tolerates chalk and dry ground. Performs best on lean, free-draining soil; rich or moist ground gives greener leaves and looser growth. Tolerates a wide pH range including alkaline chalk. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting cotinus coggygria 'grace' — frequently asked questions

How often should you repot cotinus coggygria 'grace'?

Every 2–3 years; top-dress in the in-between years for cotinus coggygria 'grace'. Fully repot cotinus coggygria 'grace' 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 poor to moderate, sharply drained soil; tolerates chalk and dry ground. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does cotinus coggygria 'grace' need?

When is the best time of year to repot cotinus coggygria 'grace'?

Should you top-dress or fully repot cotinus coggygria 'grace'?

For a big, heavy cotinus coggygria 'grace', 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 cotinus coggygria 'grace' after repotting?

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