Repotting guide

When & how to repot Prunus subhirtella 'Autumnalis' (Prunus subhirtella 'Autumnalis')

Also called Autumn Cherry, Winter Cherry.

More about prunus subhirtella 'autumnalis'

About Prunus subhirtella 'Autumnalis'

Prunus subhirtella 'Autumnalis' · also called Autumn Cherry, Winter Cherry · flowering

Prunus subhirtella 'Autumnalis' is the winter-flowering cherry, valued for semi-double white blooms that open in flushes from late autumn through mild spells into early spring. A graceful, spreading small tree, it brings flower to the dormant season, follows with bronze new leaves and good autumn tints, and suits lawns and mixed borders.

Mature size: Around 8 m tall and 8 m wide at maturity, forming a broad, rounded head.

How to tell prunus subhirtella 'autumnalis' needs repotting

Repotting on a calendar is less reliable than reading the plant. For prunus subhirtella 'autumnalis', 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 prunus subhirtella 'autumnalis' 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 prunus subhirtella 'autumnalis'

Every 2–3 years; top-dress in the in-between years. Prunus subhirtella 'Autumnalis''s growth habit — small deciduous tree with a rounded, spreading, somewhat open crown and slender twigs; moderate growth rate and a graceful, airy outline. — sets the pace. Prunus subhirtella 'Autumnalis' is the winter-flowering cherry, valued for semi-double white blooms that open in flushes from late autumn through mild spells into early spring. A graceful, spreading small tree, it brings flower to the dormant season, follows with bronze new leaves and good autumn tints, and suits lawns and mixed borders.

What size pot to step prunus subhirtella 'autumnalis' up to

Move up exactly one pot size. A heavy prunus subhirtella 'autumnalis' 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 prunus subhirtella 'autumnalis'

Early spring, just as new growth restarts, is the ideal window for prunus subhirtella 'autumnalis'. 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 prunus subhirtella 'autumnalis'

Consider top-dressing first. If prunus subhirtella 'autumnalis' 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 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 prunus subhirtella 'autumnalis' in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave prunus subhirtella 'autumnalis' 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 prunus subhirtella 'autumnalis'

Prunus subhirtella 'Autumnalis' wants fertile, moist but well-drained loam. Grows on chalk, clay, loam and sand with good drainage; prefers neutral to slightly alkaline pH. Avoid heavy, waterlogged ground that promotes root problems. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting prunus subhirtella 'autumnalis' — frequently asked questions

How often should you repot prunus subhirtella 'autumnalis'?

Every 2–3 years; top-dress in the in-between years for prunus subhirtella 'autumnalis'. Fully repot prunus subhirtella 'autumnalis' 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 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 prunus subhirtella 'autumnalis' need?

When is the best time of year to repot prunus subhirtella 'autumnalis'?

Should you top-dress or fully repot prunus subhirtella 'autumnalis'?

For a big, heavy prunus subhirtella 'autumnalis', 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 prunus subhirtella 'autumnalis' after repotting?

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