Repotting guide

When & how to repot Black Redcurrant (Ribes nigrum 'Ben Lomond')

Also called Ben Lomond blackcurrant.

More about black redcurrant

About Black Redcurrant

Ribes nigrum 'Ben Lomond' · also called Ben Lomond blackcurrant · edible

'Ben Lomond' is a reliable, heavy-cropping blackcurrant valued for its late flowering, which dodges spring frosts, and its good mildew resistance. It bears large, tart, vitamin-C-rich berries in mid-summer on a sturdy, upright bush. Hardy and easy in any sunny or part-shaded spot with rich, moist soil, it suits jam, cordials, and freezing.

Mature size: Around 1.2-1.5 m tall and 1.2-1.5 m wide at maturity.

How to tell black redcurrant needs repotting

Repotting on a calendar is less reliable than reading the plant. For black redcurrant, 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 black redcurrant 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 black redcurrant

Pot on seedlings as they grow; not a perennial repot. Black Redcurrantis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Vigorous, upright deciduous shrub that fruits best on one- and two-year-old wood. Pruned by removing about a third of the oldest stems to the base each winter, it renews itself continually and stays productive for many years..

What size pot to step black redcurrant up to

Pot black redcurrant 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 black redcurrant

Pot black redcurrant 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 black redcurrant

Pot on before it is root-bound. Check black redcurrant 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 rich, moisture-retentive, free-draining loam, slightly acidic to neutral (ph 6.0-6.8) 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 black redcurrant 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 black redcurrant

Black Redcurrant wants rich, moisture-retentive, free-draining loam, slightly acidic to neutral (ph 6.0-6.8). Blackcurrants are hungry, greedy feeders that love deep, fertile soil enriched with plenty of well-rotted manure or compost. They tolerate heavier soils than most fruit provided drainage is adequate; avoid thin, dry, or chalky ground. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting black redcurrant — frequently asked questions

How often should you repot black redcurrant?

Pot on seedlings as they grow; not a perennial repot for black redcurrant. Black Redcurrant is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into rich, moisture-retentive, free-draining loam, slightly acidic to neutral (ph 6.0-6.8) 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 black redcurrant need?

When is the best time of year to repot black redcurrant?

Can you put black redcurrant straight into a much bigger pot?

No. Even a fast-growing black redcurrant 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 black redcurrant after repotting?

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