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Repotting guide

When & how to repot Czar Plum (Prunus domestica 'Czar')

Also called Czar plum, culinary plum.

More about czar plum

About Czar Plum

Prunus domestica 'Czar' · also called Czar plum, culinary plum · edible

Czar is a hardy, reliable English culinary plum from the 1870s, bearing heavy crops of small-to-medium blue-black fruit with greenish-yellow flesh, ideal for cooking, jam and stewing. Self-fertile and frost-tolerant in blossom, it crops dependably even in cooler, less sheltered gardens, ripening in late July to August.

Mature size: Rootstock-dependent: about 2.5-3 m on dwarfing Pixy, 3-4 m on semi-dwarfing St Julien A, taller on vigorous stocks. St Julien A is the usual choice for a manageable garden tree.

How to tell czar plum needs repotting

Repotting on a calendar is less reliable than reading the plant. For czar plum, 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 czar plum

Pot on seedlings as they grow; not a perennial repot. Czar Plumis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Deciduous, upright-spreading tree of moderate vigour, usually grown as a bush or half-standard. Self-fertile and a useful pollinator for other plums in flowering group 3; needs no partner to crop, which adds to its reliability..

What size pot to step czar plum up to

Pot czar plum 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 czar plum

Pot czar plum 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 czar plum

  1. Pot on before it is root-bound. Check czar plum 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 fertile, moisture-retentive 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 czar plum 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 czar plum

Czar Plum wants fertile, moisture-retentive loam. Prefers deep, fertile, moisture-retentive loam at pH 6.0 to 6.5 that drains adequately. Tolerates heavier ground than many fruit trees but dislikes waterlogging and very dry, thin soils. Enrich at planting and mulch annually. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting czar plum — frequently asked questions

How often should you repot czar plum?

Pot on seedlings as they grow; not a perennial repot for czar plum. Czar Plum is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into fertile, moisture-retentive 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 czar plum need?

Pot czar plum 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 czar plum?

Pot czar plum 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 czar plum straight into a much bigger pot?

No. Even a fast-growing czar plum 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 czar plum after repotting?

Not immediately. Wait about 1 week after repotting czar plum. 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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