Repotting guide

When & how to repot Sweet Cherry 'Sunburst' (Prunus avium 'Sunburst')

Also called Sunburst cherry.

More about sweet cherry 'sunburst'

About Sweet Cherry 'Sunburst'

Prunus avium 'Sunburst' · also called Sunburst cherry · edible

Sunburst is a self-fertile sweet cherry bearing very large, almost black, soft-fleshed fruit with rich, sweet flavour in midsummer. Needing no pollination partner, it suits single-tree gardens and crops reliably on dwarfing rootstocks. The big, juicy cherries are tender and best eaten fresh, though the soft skins are prone to splitting in wet weather.

Mature size: On Gisela 5 roughly 2.5-3 m tall and wide; on vigorous Colt around 4-5 m. Fans stay flatter for easy netting and ripening.

Watch for — Bird damage: Ripening cherries are quickly stripped by birds. Net the compact tree as the fruit colours to protect the crop.

How to tell sweet cherry 'sunburst' needs repotting

Repotting on a calendar is less reliable than reading the plant. For sweet cherry 'sunburst', watch for these signs:

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot sweet cherry 'sunburst' on before it becomes hard root-bound.

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 sweet cherry 'sunburst'

Pot on seedlings as they grow; not a perennial repot. Sweet Cherry 'Sunburst'is grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Vigorous deciduous tree tamed on Gisela 5 for a compact bush or fan. White mid-spring blossom precedes the heavy crop of large, dark, soft cherries in midsummer..

What size pot to step sweet cherry 'sunburst' up to

Pot sweet cherry 'sunburst' on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

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 sweet cherry 'sunburst'

Pot sweet cherry 'sunburst' on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting sweet cherry 'sunburst'

Pot on before it is root-bound. Check sweet cherry 'sunburst' regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
Pot into rich mix. Set it into fresh deep, fertile, well-drained loam at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water sweet cherry 'sunburst' in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for sweet cherry 'sunburst'

Sweet Cherry 'Sunburst' wants deep, fertile, well-drained loam. Likes slightly acidic to neutral soil (around pH 6.5) and resents waterlogging. Improve drainage on heavy soils and avoid shallow, droughty or frost-prone sites. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting sweet cherry 'sunburst' — frequently asked questions

How often should you repot sweet cherry 'sunburst'?

Pot on seedlings as they grow; not a perennial repot for sweet cherry 'sunburst'. Sweet Cherry 'Sunburst' is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into deep, fertile, well-drained loam so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does sweet cherry 'sunburst' need?

When is the best time of year to repot sweet cherry 'sunburst'?

Can you put sweet cherry 'sunburst' straight into a much bigger pot?

No. Even a fast-growing sweet cherry 'sunburst' should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise sweet cherry 'sunburst' after repotting?

Not immediately. Wait about 1 week after repotting sweet cherry 'sunburst'. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.