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A bite of sweetness, straight from the pergola 🥝
Family: Actinidiaceae · Pot diameter: 13cm · organically grown · Height: approximately 45cm
Actinidia arguta ‘Issai’ brings the pleasure of kiwi fruit to a more manageable, relatively compact climbing plant. It produces small, smooth fruit that can be eaten whole, without peeling, and one vine can set a crop on its own. Fresh foliage quickly dresses a support, while the late-summer harvest gives the garden or terrace something genuinely rewarding to anticipate each year.
It is an excellent choice for a sunny wall, wires or a sturdy pergola where edible greenery is wanted without the full scale of a typical kiwi. Training the stems in clean horizontal tiers turns it into a living architectural feature.
Three characteristics explain why ‘Issai’ fits so naturally into a modern edible garden.
The small green fruit has smooth, edible skin and can be eaten whole once it yields slightly.
It remains noticeably more compact than vigorous large-fruited kiwis when trained and pruned.
‘Issai’ is self-fertile and can crop on its own. A compatible male pollinator may improve fruit set.
Why you will love it: It combines genuinely enjoyable, easy-to-eat fruit with foliage that makes good use of vertical space.
Plant it against a south-east or south-west wall, on tensioned wires or a sturdy pergola. Allow for 2.5–4m of trained growth and keep the root zone in free-draining soil, away from heavy root competition.
The fresh green foliage works with white, blue and violet flowers. Companions should enjoy sun, good drainage and regular watering without crowding the vine's base.
Sun or a very bright position, sheltered from strong winds.
Water deeply when the upper layer of soil begins to dry.
Cold hardy, although young spring growth is vulnerable to late frost.
Eat only ripe, washed fruit; other plant parts are not presented as food.
Use fertile, deep soil that stays moist yet drains freely. Avoid heavy, persistently saturated ground because ‘Issai’ is sensitive to root rot.
Maintain even moisture from bud break through fruit development. In a container, test the compost and water when the surface dries rather than following a fixed calendar.
Lead one main stem up a firm post, then train two horizontal arms along wires. Mature foliage and fruit need a genuinely strong structure.
Apply mature compost or a balanced feed in spring, following its label. Avoid excessive nitrogen, which encourages long shoots at the expense of balance.
Keep a small clear circle around the stem and mulch farther out without touching the bark. This retains moisture without leaving the crown wet.
Air movement, clean tools and freedom from waterlogging reduce problems. Check ties and wires so they do not constrict rapidly thickening stems.
‘Issai’ is self-fertile, so one vine can crop. A nearby compatible male A. arguta may improve fruit set, but cannot guarantee a crop.
It flowers in spring and the small smooth fruit usually ripens from late summer into early autumn, depending on site and weather.
Test one fruit: it is ready when it yields slightly to gentle pressure and tastes fully developed. Snip or twist carefully without damaging the shoot.
Birds quickly find ripening fruit. Fit properly tensioned netting before the fruit softens and check it daily so wildlife cannot become trapped.
Young / unestablished plant: rooting and framework training come first. Meaningful cropping follows once the vine is well established.
Winter for structure · summer for shoot control
‘Issai’ fruits on new shoots arising from the previous year's wood. The aim is a permanent trunk, horizontal arms and regularly renewed fruiting laterals.
Action: Choose the strongest shoot as the trunk and tie it loosely upright. Remove only competing or damaged shoots.
Retain: Keep the leaf area and length needed to build roots and reach the first wire.
Action: Form two horizontal arms and retain laterals roughly every 25–30cm. In summer, shorten fruiting shoots to 4–5 leaves beyond the last fruit.
Retain: Keep well-placed previous-year wood because it carries the next season's fruiting shoots.
Action: In winter, shorten fruited stems to 3–4 buds beyond the last fruiting lateral and gradually renew the oldest laterals.
Retain: Keep the permanent trunk, both arms and enough healthy previous-year wood. Renew only part of the old lateral system each year.
Use sharp, clean tools suited to the diameter of the wood.
After fruit set, light shortening is useful for light and control. Do not carry out heavy renewal in hot weather.
Do not do this: Do not remove all previous-year wood: it carries the new shoots that will flower and fruit.
Early energy goes into roots and one clean leader rather than covering the whole pergola immediately.
Horizontal arms organise growth and turn new laterals into accessible fruiting wood.
Annual renewal keeps the vine light, productive and distinctly smaller than an untrained kiwi.
On support it forms one trunk and horizontal arms, on a smaller scale than large-fruited kiwis.
After leaf fall the trained trunk and horizontal framework are clear, making winter assessment straightforward.
What to expect after planting: Early energy goes into roots and one clean leader rather than covering the whole pergola immediately.
‘Issai’ entered cultivation as a Japanese selection of hardy kiwi and is now accepted by the RHS as Actinidia arguta ‘Issai’.
A breeder, selection year and parentage have not been published consistently enough to state as fact. Its secure story therefore rests on Japanese origin and its established cultivated identity.
Unlike most kiwis that need separate male and female plants, ‘Issai’ can crop on its own. Compatible cross-pollen may still improve fruit set.
Flowers do not appear randomly on old trunks: they develop on new shoots arising from the basal part of the previous season's growth.
Six practical answers for choosing, growing, harvesting and pruning this exact cultivar.
No. ‘Issai’ is self-fertile and can crop on its own. A compatible male pollinator may improve fruit set.
Yes. The small smooth fruit is eaten whole once washed and ripe.
Yes, in a large container with excellent drainage, even moisture and a very strong support. The roots must never sit in water.
At maturity allow roughly 2.5–4m in height and spread, organised on wires or a pergola.
Insufficient sun, late frost, water stress or very late growth can delay ripening. A sheltered sunny position is important.
Framework work and renewal are done in winter. Summer pruning is limited to controlled shortening after fruit set.
