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Repotting guide

When & how to repot Issai Kiwi (Actinidia arguta 'Issai')

Also called Issai kiwi, self-fertile hardy kiwi.

More about issai kiwi

About Issai Kiwi

Actinidia arguta 'Issai' · also called Issai kiwi, self-fertile hardy kiwi · edible

'Issai' is a self-fertile hardy kiwi that fruits without a separate male pollinator, making it ideal for small gardens. It bears smooth-skinned, grape-sized kiwi berries on a vigorous deciduous vine and can crop young. Less rampant than the species, it still needs sturdy support, full sun, and free-draining soil to ripen well.

Mature size: About 3-4 m of vine (10-13 ft) on support

Watch for — Frost damage to new growth: Spring shoots and flowers are frost-tender and easily lost to a late freeze. Site in a sheltered sunny spot and protect early growth when frost is forecast.

How to tell issai kiwi needs repotting

Repotting on a calendar is less reliable than reading the plant. For issai kiwi, 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 issai kiwi

Pot on seedlings as they grow; not a perennial repot. Issai Kiwiis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Self-fertile, twining deciduous vine; more compact and less vigorous than wild A. arguta but still needs permanent support. Fruits on current-season shoots from one-year-old wood; suits training on wires or a trellis..

What size pot to step issai kiwi up to

Pot issai kiwi 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 issai kiwi

Pot issai kiwi 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 issai kiwi

  1. Pot on before it is root-bound. Check issai kiwi 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, free-draining loam, slightly acidic 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 issai kiwi 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 issai kiwi

Issai Kiwi wants fertile, free-draining loam, slightly acidic. Prefers a pH of about 5.5-6.5 and dislikes chalky, limey soil. Add plenty of organic matter and ensure sharp drainage. In pots use a loam-based compost with added grit for the fleshy, rot-prone roots. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting issai kiwi — frequently asked questions

How often should you repot issai kiwi?

Pot on seedlings as they grow; not a perennial repot for issai kiwi. Issai Kiwi is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into fertile, free-draining loam, slightly acidic 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 issai kiwi need?

Pot issai kiwi 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 issai kiwi?

Pot issai kiwi 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 issai kiwi straight into a much bigger pot?

No. Even a fast-growing issai kiwi 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 issai kiwi after repotting?

Not immediately. Wait about 1 week after repotting issai kiwi. 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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