Issai hardy kiwi vines
Photo: "Szigetvár, 7900 Hungary" by jozsefh2 · CC BY 3.0
Fruit · Self-fertile-kiwi

Issai hardy kiwi vines

Perennial · Actinidiaceae

Issai is the unusual self-fertile hardy kiwi that gives grape-sized smooth-skinned fruit without needing a separate male pollinator in most home plantings. The fruit can be eaten whole without peeling, and the vine is smaller than many hardy kiwis, but it still needs a strong permanent trellis. It suits gardeners in cooler zones who want a kiwi-like fruit and can wait through the establishment years.

At a Glance

Days to Maturity
1095–1825 days
Sun
6+ hours
full sun; afternoon shade is helpful in hotter climates
Spacing
36–120 "
Container
Not Ideal
25+ gallon pot
Height
3–20 ft

Zone Planting Guide

Growing Guide

Transplanting

Min Soil Temp 40°F
Harden Off 0 days

Watering

Weekly Water 1–1.5 "
Needs Moderate
Method Drip

Soil

pH Range 6–7
Soil Type Moist but well-drained soil rich in organic matter; woody fruit hates waterlogging.
Support Arbor — Needs a permanent, heavy-duty trellis or arbor that can carry mature vine weight.

Resilience

Heat: Moderate Cold: Very-high Drought: Moderate

Common Problems

black-rot
Cause: Dense growth and humid weather favor fungal disease.
Prevention: Prune for airflow, mulch, and avoid overhead irrigation.
bird-pressure
Cause: Ripening fruit attracts birds quickly.
Prevention: Net shrubs or vines before the crop colors.

Nutrition

Feeding Intensity Light feeder
Recommended Recipes Root drench, Worm castings topdress

Harvest

Fruit reaches full cultivar color, detaches cleanly, and tastes fully developed; exact signs vary by crop.

Expected Yield 3–15 lbs/plant
Storage 14 days — Refrigerate ripe fruit; pick just before fully soft for best keeping.

Sources

seed_catalog Raintree Nursery university Penn State Extension university University of Minnesota Extension

More Fruits

Issai hardy kiwi vines Planting Dates by Zone

Planting dates for Issai hardy kiwi vines vary by USDA hardiness zone. Select your zone below for frost dates, start-indoors timing, and a full monthly planting calendar.

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