Repotting guide

When & how to repot Kousa Dogwood (Cornus kousa)

Also called Kousa Dogwood, Chinese Dogwood.

More about kousa dogwood

About Kousa Dogwood

Cornus kousa · also called Kousa Dogwood, Chinese Dogwood · flowering

Kousa dogwood is an East Asian small tree blooming about a month later than flowering dogwood, with pointed creamy-white bracts held above the foliage, followed by raspberry-like edible red fruit and crimson-purple autumn color. More disease- and sun-tolerant than Cornus florida, it suits mixed borders and woodland edges in moist, acidic, well-drained soil.

Mature size: About 5-9 m tall and 5-9 m wide at maturity

Watch for — Leaf scorch: Brown leaf margins from hot sun, wind, or dry soil. Provide afternoon shade in hot climates and keep the root zone mulched and evenly moist.

How to tell kousa dogwood needs repotting

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

Every 2–3 years; top-dress in the in-between years. Kousa Dogwood's growth habit — small deciduous tree, vase-shaped when young and broadening to a rounded, horizontally tiered crown with attractive exfoliating mottled bark with age. — sets the pace. Kousa dogwood is an East Asian small tree blooming about a month later than flowering dogwood, with pointed creamy-white bracts held above the foliage, followed by raspberry-like edible red fruit and crimson-purple autumn color. More disease- and sun-tolerant than Cornus florida, it suits mixed borders and woodland edges in moist, acidic, well-drained soil.

What size pot to step kousa dogwood up to

Move up exactly one pot size. A heavy kousa dogwood 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 kousa dogwood

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

Consider top-dressing first. If kousa dogwood 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, fertile, well-drained acidic to neutral soil 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 kousa dogwood in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave kousa dogwood 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 kousa dogwood

Kousa Dogwood wants moist, fertile, well-drained acidic to neutral soil. Prefers acidic to neutral pH 5.5-7.0 enriched with organic matter. Tolerates a wider range than Cornus florida but dislikes waterlogged clay and strongly alkaline soils that induce chlorosis. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting kousa dogwood — frequently asked questions

How often should you repot kousa dogwood?

Every 2–3 years; top-dress in the in-between years for kousa dogwood. Fully repot kousa dogwood 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, fertile, well-drained acidic to neutral soil. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does kousa dogwood need?

When is the best time of year to repot kousa dogwood?

Should you top-dress or fully repot kousa dogwood?

For a big, heavy kousa dogwood, 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 kousa dogwood after repotting?

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