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Repotting guide

When & how to repot Loganberry (Rubus × loganobaccus)

Also called loganberry, Logan berry.

More about loganberry

About Loganberry

Rubus × loganobaccus · also called loganberry, Logan berry · edible

The loganberry is a hybrid of raspberry and blackberry, raised in 1880s California, bearing long, deep-red, tart-sweet berries excellent for jams, pies and cordials. It is a vigorous trailing caneberry fruiting in midsummer on the previous year's canes. Thornless forms like 'LY654' make harvesting easy; it crops reliably in cool British gardens.

Mature size: Canes reach 2-3 m or more and spread widely; needs a strong wire framework and generous spacing.

Watch for — Cane spot and spur blight: Purple lesions on canes weaken growth. Cut out and destroy infected canes and avoid overhead watering to limit fungal spread.

How to tell loganberry needs repotting

Repotting on a calendar is less reliable than reading the plant. For loganberry, watch for these signs:

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 loganberry

Pot on seedlings as they grow; not a perennial repot. Loganberryis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Vigorous, trailing thornless or thorned caneberry; biennial canes fruit in their second year, so new canes are trained separately from fruiting ones, often fan-trained or in a weaving system..

What size pot to step loganberry up to

Pot loganberry 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 loganberry

Pot loganberry 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 loganberry

  1. Pot on before it is root-bound. Check loganberry regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
  2. 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.
  3. 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.
  4. Pot into rich mix. Set it into fresh deep, fertile, moisture-retentive but well-drained loam at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
  5. Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water loganberry 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 loganberry

Loganberry wants deep, fertile, moisture-retentive but well-drained loam. Likes rich, organic ground at pH 6.0-6.7. Avoid waterlogged or thin chalky soils. Improve with compost and fix sturdy horizontal wires for training the long canes. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting loganberry — frequently asked questions

How often should you repot loganberry?

Pot on seedlings as they grow; not a perennial repot for loganberry. Loganberry 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, moisture-retentive but 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 loganberry need?

Pot loganberry 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. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot loganberry?

Pot loganberry 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.

Can you put loganberry straight into a much bigger pot?

No. Even a fast-growing loganberry 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 loganberry after repotting?

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

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