Repotting guide

When & how to repot Satomi Dogwood (Cornus kousa 'Satomi')

Also called Satomi Dogwood, Satomi Japanese Dogwood, Pink Kousa Dogwood.

More about satomi dogwood

About Satomi Dogwood

Cornus kousa 'Satomi' · also called Satomi Dogwood, Satomi Japanese Dogwood · flowering

Satomi Dogwood is a celebrated Cornus kousa cultivar bearing deep rose-pink to crimson bracts in early summer — one of the most vivid pink-flowered dogwoods. Foliage turns red-purple in autumn alongside ornamental red fruits. Resistant to dogwood anthracnose, it suits woodland gardens and focal plantings in moist, acidic soil.

Mature size: 5–7 m tall (16–23 ft), spread 4–6 m (13–20 ft)

Watch for — Root rot in wet soils: Prolonged waterlogging causes Phytophthora root rot. Plant on a slight elevation or add grit to improve drainage. Choose a well-drained site; never plant in a frost pocket where water pools.

How to tell satomi dogwood needs repotting

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

Every 2–3 years; top-dress in the in-between years. Satomi Dogwood's growth habit — upright-vase to broadly pyramidal deciduous tree when mature; layered branching with horizontal tiers — sets the pace. Satomi Dogwood is a celebrated Cornus kousa cultivar bearing deep rose-pink to crimson bracts in early summer — one of the most vivid pink-flowered dogwoods. Foliage turns red-purple in autumn alongside ornamental red fruits. Resistant to dogwood anthracnose, it suits woodland gardens and focal plantings in moist, acidic soil.

What size pot to step satomi dogwood up to

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

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

Consider top-dressing first. If satomi 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, acidic, well-drained loam or sandy 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 satomi dogwood in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave satomi 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 satomi dogwood

Satomi Dogwood wants moist, acidic, well-drained loam or sandy loam. pH 5.5–6.5 ideal. Rich, humus-amended soil with sharp drainage gives best results. Slightly more tolerant of varying pH than C. florida but still performs poorly on chalk or heavy alkaline soils. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting satomi dogwood — frequently asked questions

How often should you repot satomi dogwood?

Every 2–3 years; top-dress in the in-between years for satomi dogwood. Fully repot satomi 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, acidic, well-drained loam or sandy 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 satomi dogwood need?

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

Should you top-dress or fully repot satomi dogwood?

For a big, heavy satomi 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 satomi dogwood after repotting?

Not immediately. Wait about 4 weeks after repotting satomi 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.