Shrub · Actinidiaceae
Hardy Kiwi
Actinidia arguta
A cold-hardy vine that hands you smooth, grape-sized fruit you eat whole, no peeling required.
Full sun
Every 5–7 days
USDA 3–8
25–30 ft · 7.6–9.1 m
Overview
Hardy kiwi is the tougher, smaller-fruited cousin of the fuzzy kiwi at the store. The berries are about the size of a grape with smooth, hairless skin, sweet and aromatic, and you pop them whole into your mouth. The vine shrugs off cold that would kill a regular kiwi, holding up in winters down to -29°F (-34°C).
It is a vigorous climber and then some. A mature vine can throw out 30 feet (about 9 meters) of growth and grow heavy enough to pull down a flimsy support, so it needs a serious arbor or T-bar trellis from the start. The same drive that makes it spread fast has earned it an invasive flag in parts of the northeastern US, so keep it away from wild ground and check local rules first.
The one quirk that catches new growers is fruit set. Hardy kiwi is dioecious, meaning male and female flowers grow on separate plants, so you need at least one male to pollinate your females. Give it a sunny, sheltered spot, a strong frame to climb, and a few years of patience, and it rewards you with a hefty late-summer crop.
Care
The short version: full sun and rich, well-drained soil, kept evenly moist, on a strong trellis you'll never regret building heavy. Plant a male alongside your females, prune hard in winter, and wait a few years for the first real crop.
Light
Hardy kiwi fruits best in full sun, which ripens the berries and feeds the heavy growth. It will take partial shade, but expect a lighter crop. A warm, sheltered spot also guards the early shoots from late frost.
Water
Keep the soil evenly moist, especially while the vine is establishing and while it carries fruit, watering roughly every 5 to 7 days. Water deeply rather than often. The one rule that overrides the rest is drainage, since soggy ground invites root rot.
Soil
Give it fertile, well-drained loam rich in organic matter, though it tolerates clay, loam, or sand. It likes things on the acidic side, around pH 5.0 to 6.5. Drainage matters more than texture, so work in compost and avoid spots where water pools.
Temperature
This is a genuinely cold-hardy vine, taking winter lows near -29°F (-34°C) and summer heat up to about 86°F (30°C). The weak point is timing, not cold itself, since a late spring frost can burn the tender new shoots after the vine has leafed out.
Humidity
Average outdoor humidity in the 40% to 70% range suits it well, so there's no number to fuss over. Good airflow around the trellis matters more, keeping the dense canopy from staying damp.
Feeding
Feed with a balanced complete fertilizer through spring and early summer while the vine is in active growth. Go easy on the nitrogen. Too much pushes leafy vine at the expense of fruit, which is the last thing you want from a plant this vigorous.
Pruning
Hardy kiwi needs real pruning to stay productive and in bounds. In winter, cut each fruiting stem back to 8 to 10 buds. Come summer, shorten the long, vigorous shoots again and keep the whole vine trained tight to its trellis.
Repotting
This is an in-ground plant, grown on a trellis rather than in a pot, so it's rarely repotted. If you do start one in a container, move it on before the roots circle, stunt, or dry out unusually fast, then get it into the ground.
Size & spacing
Plan for a big vine. It reaches 25 to 30 feet (7.5 to 9 m) long and spreads 7 to 20 feet (2.1 to 6 m) wide, so give it a sturdy, dedicated frame and plenty of room to run.
When to plant
Hardy kiwi runs on the seasons. Start seed in late winter after a long cold spell, set young plants out in spring once hard frost has passed, and look for fragrant flowers around June and grape-sized fruit ripening from late summer into fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Late winter (Feb-Mar) after 30-60 days cold stratification of seed
- Plant: Spring, after danger of hard frost has passed
- Harvest: Fragrant greenish-white flowers in late spring (around June); grape-sized fruit ripens late summer into fall (Sep-Oct)
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Most hardy kiwi trouble traces back to three things: no fruit, wet feet, or a late frost. Read the early signs below and you can sort out which one you're facing. Match the symptom, then act before it costs you a season.
Wilting and yellowing in soggy ground
Soil that stays wet starves the roots of air and invites root rot, which shows up as wilting, yellowing, and slow dieback even though the ground is plenty moist. Dig down and you'll find brown, mushy roots instead of firm white ones. Cut back on watering and improve drainage, or move the vine to a raised, free-draining spot before the rot spreads.
Fix:
- Improve drainage or move to a raised, well-drained site
- Reduce watering frequency
Plenty of leafy growth but no fruit
Hardy kiwi is dioecious, so a female vine needs a male nearby to pollinate it, and a single plant on its own will never fruit. Patience matters too, since a young vine often takes 3 to 5 years before it bears at all. Plant at least one male for every 6 to 8 females, give pollinators a clear path to the flowers, and wait the vine out.
Fix:
- Plant at least one male per 6-8 females
- Be patient; vines fruit only after several years of growth
- Ensure bees and other pollinators can reach the flowers
New spring shoots turn black and collapse
Hardy kiwi leafs out early, and a late spring frost can scorch the tender new shoots overnight, blackening them so they wilt and fold. The vine usually bounces back, so prune out the dead growth and let it resprout. Site it away from low frost pockets, and throw a cover over it when a late cold snap is forecast.
Fix:
- Prune out blackened growth; vines usually resprout
- Cover or protect vines when late frost threatens
Toxicity
Good news for pet owners: hardy kiwi is not toxic to cats, dogs, or anyone else. The fruit is grown to be eaten, and the rest of the plant won't poison an animal that nibbles it. One quirk worth knowing is that cats may be drawn to the foliage the way they are to catnip or silver vine, which is harmless attraction rather than any kind of danger.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Hardy kiwi is safe for cats, and the fruit causes no poisoning. The catch is the opposite of danger: like silver vine, the foliage can act as a catnip-like draw, so a cat may roll on it or chew the young stems, which is harmless aside from the odd chewed shoot.
Dogs None
Nothing to worry about here. A dog that snacks on a few of the grape-sized berries will be fine, though wolfing down a big pile of any new fruit might bring on a passing bout of loose stool.
Horses Safe
Horses can graze near the vine without harm, as neither the leaves nor the fruit hold anything toxic to them.
Rabbits Safe
Safe for rabbits. A nibble of the soft fruit makes a fine occasional treat, though their staple should stay hay and greens rather than sweet kiwi.
Livestock Safe
Cattle, goats, and sheep can browse the foliage and fallen fruit without any risk of poisoning from this plant.
Birds Safe
Birds happily eat the ripe berries with no ill effect, and in fact they help carry the seed around, part of why the vine spreads so readily.
People Safe
The smooth-skinned fruit is grown to be eaten whole like a grape, no peeling needed, and it is perfectly safe for children and adults alike.
Fruit is safe if a pet nibbles a few; very large amounts of any novel fruit may cause mild, temporary stomach upset.
Varieties
A handful of named cultivars cover most home plantings, split between fruiting females and the males grown purely to pollinate them. These are the ones worth knowing by name.
Ananasnaya (Anna)
A popular, heavy-cropping female cultivar prized for its sweet, aromatic fruit.
Issai
A partly self-fertile female that can set some fruit even without a separate male vine nearby.
Geneva
An early-ripening female selection that crops well and brings the harvest forward.
Meader Male
A male pollenizer that bears no fruit of its own and exists only to pollinate the females around it.
Companions
Hardy kiwi grows best next to a male pollenizer and the bees that work its flowers, and worst when left to climb into trees and shrubs it can smother.
Plant near
Male Actinidia arguta cultivar: Required pollenizer; without a male nearby, female vines set no fruit.
Pollinator-attracting flowers: Bees and other pollinators improve fruit set on the kiwi flowers.
Keep apart
Trees and shrubs: The vigorous vine can climb and smother woody plants; keep it on a dedicated sturdy trellis.
How to propagate
You can multiply hardy kiwi several ways, but only some keep the sex and quality of the parent. Pick the method that fits whether you need a known cultivar or just more plants.
Stem cuttingsModerate
Softwood cuttings in early to mid summer · About 6-10 weeks to root
Cuttings are the most reliable way to copy a named male or female cultivar true to type. Take softwood cuttings in early to mid summer, and they root in about 6 to 10 weeks, which matters because you need a known sex to get fruit.
SeedModerate
Sow in late winter after 30-60 days of cold stratification · Germinates in weeks; years to reach fruiting
Seed is a gamble. Sow in late winter after 30 to 60 days of cold stratification and the seedlings sprout within weeks, but they come up variable and of unknown sex until they first flower years later, so you can't tell male from female until then.
LayeringEasy
Spring to summer · Roots within one season
Layering is the easy route. Pin a low cane down to the soil any time from spring through summer and it will root within a single season, after which you can sever it and move the new plant.
GraftingDemanding
Late winter to early spring · Takes within one growing season
Grafting is the demanding option, mostly for putting a select cultivar onto vigorous rootstock. Done in late winter to early spring, a successful graft takes within one growing season.
Myths
Hardy kiwi fruit is poisonous to pets because cats react to the plant like catnip.
Cats really can be drawn to Actinidia foliage, since the genus includes silver vine, but attraction is not poisoning. The smooth-skinned, grape-sized fruit is edible and safe for cats and dogs alike.
A single hardy kiwi vine will fruit on its own.
Most hardy kiwis are dioecious and need both a male and a female plant, roughly one male for every 6 to 8 females, to bear fruit. The exceptions are partly self-fertile types like Issai, which set at least some fruit alone.
Hardy kiwi must be peeled like fuzzy kiwifruit.
Its skin is smooth and hairless, nothing like the fuzzy grocery-store kiwi. You eat the whole berry like a grape, skin and all.