Repotting guide

When & how to repot Bob Gordon Elderberry (Sambucus nigra 'Bob Gordon')

Also called Bob Gordon elderberry, high-yield elderberry.

More about bob gordon elderberry

About Bob Gordon Elderberry

Sambucus nigra 'Bob Gordon' · also called Bob Gordon elderberry, high-yield elderberry · edible

'Bob Gordon' is a heavy-cropping American elderberry selection whose fruiting heads droop downward as they ripen, deterring birds and concentrating sugars. Fully hardy and vigorous, it produces large clusters of small dark berries for cordials, syrups and wine. Berries and flowers are edible only when cooked; raw fruit, leaves and stems are mildly toxic.

Mature size: 1.8-2.5 m tall and wide, reaching 3 m if left unpruned; spreads slowly by suckers.

How to tell bob gordon elderberry needs repotting

Repotting on a calendar is less reliable than reading the plant. For bob gordon elderberry, 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 bob gordon elderberry 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 bob gordon elderberry

Pot on seedlings as they grow; not a perennial repot. Bob Gordon Elderberryis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Vigorous, suckering deciduous shrub with upright then arching canes; flowers on the current season's wood, so it responds well to renewal pruning of old canes in late winter..

What size pot to step bob gordon elderberry up to

Pot bob gordon elderberry 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 bob gordon elderberry

Pot bob gordon elderberry 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 bob gordon elderberry

Pot on before it is root-bound. Check bob gordon elderberry 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 moist, fertile, humus-rich 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 bob gordon elderberry 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 bob gordon elderberry

Bob Gordon Elderberry wants moist, fertile, humus-rich loam. Tolerant of a wide pH range around 5.5-7.0 and of heavier, damp soils that defeat many fruit. Enrich with compost and mulch to retain moisture. Avoids only the driest, sharply drained 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 bob gordon elderberry — frequently asked questions

How often should you repot bob gordon elderberry?

Pot on seedlings as they grow; not a perennial repot for bob gordon elderberry. Bob Gordon Elderberry is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into moist, fertile, humus-rich 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 bob gordon elderberry need?

When is the best time of year to repot bob gordon elderberry?

Can you put bob gordon elderberry straight into a much bigger pot?

No. Even a fast-growing bob gordon elderberry 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 bob gordon elderberry after repotting?

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