How to Grow Issai Kiwifruit
Wikimedia Commons
Issai Kiwifruit
Actinidia arguta
vineIssai is a self-fertile hardy kiwifruit variety that produces small, sweet, edible fruits with thin skin that can be eaten whole. Unlike traditional fuzzy kiwis, these berries are smooth-skinned and grape-sized, with a delicate, tropical flavor. It's a vigorous deciduous vine ideal for home gardeners seeking a productive, cold-hardy fruit plant.
When should you plant Issai Kiwifruit in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Issai Kiwifruit timeline · Pittsburgh, PA (Zone 6b)
-
Plant Issai Kiwifruit
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Issai Kiwifruit
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Issai Kiwifruit dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-8, hardy to zone 4b with winter protection
Sign up free to see if Issai Kiwifruit grows in your zone — and get a personalized planting timeline.
Get my Issai Kiwifruit timeline →Growth Stages
Establishment (Year 1)
1 yearNewly planted vine focuses on root and shoot development. Growth is moderate, with 3-6 feet of vine growth possible.
Provide sturdy support structure. Water regularly and keep weeds cleared. Apply 2-3 inches of mulch around base. Do not allow flowering in first year.
Vegetative Growth (Years 2-3)
2 yearsVine grows vigorously, developing extensive foliage and a strong framework along trellis or support. Vines can grow 8-15 feet.
Train and prune to create main framework branches. Continue regular watering. Apply balanced fertilizer in spring. Pinch off flowers initially to encourage vine establishment.
Flowering (Late Spring/Early Summer)
3-4 weeksSmall, white flowers with yellow stamens appear in clusters along the vine. Self-fertile Issai produces both male and female flowers.
Do not prune excessively during flowering. Ensure adequate pollinator access. Thin fruit set by removing weak flower clusters if needed.
Fruit Development (Summer)
6-8 weeksTiny green berries develop after flowering, growing to grape-sized fruits. Fruits remain green, maturing to soft and sweet by late summer/early fall.
Maintain consistent watering during this critical period. Apply balanced or slightly higher potassium fertilizer to support fruit quality. Thin overcrowded fruits if necessary.
Maturation & Harvest (Late Summer/Fall)
4-6 weeksFruits fully ripen on the vine, becoming soft and intensely sweet. Skin color may develop a slight reddish tint with full ripeness.
Monitor ripeness by gentle squeezing. Harvest fully ripe fruits to maximize flavor. Begin fall maintenance as temperatures drop.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Handpicking, row covers, neem oil, or Japanese beetle traps away from vines
-
Spray with water to dislodge, use sulfur dust, or apply neem oil in early spring and late fall
-
Maintain good sanitation, remove dropped fruits, use fruit exclusion bags, or deploy traps
-
Ensure proper air circulation, avoid overhead watering, remove affected branches, manage leafhopper vectors
-
Improve air circulation through pruning, apply sulfur or fungicidal soap, reduce humidity
Uses
Fresh consumption and smoothies
CulinaryIssai kiwis are eaten fresh by hand, skin and all, making them more convenient than fuzzy kiwis. They are ideal for smoothie bowls, blended beverages, or added to fruit salads for tropical flavor. [source]
Preservation and jam-making
CulinaryThe fruits can be frozen whole for smoothies, made into jam, or dried as a sweet snack. Their natural pectin content makes them excellent for preserves. [source]
Digestive and nutritional support
MedicinalKiwifruit contains actinidin, a proteolytic enzyme that aids protein digestion, and is high in vitamin C, potassium, and antioxidants supporting immune function and overall health. [source]
Pollinator and wildlife support
WildlifeThe delicate white flowers attract bees and beneficial pollinators, while the abundant fruit provides food for birds and beneficial insects in late summer and fall. [source]
Natural living trellis and ornamental screening
HouseholdBeyond productivity, Issai vines create attractive green walls and shade structures on pergolas, arbors, or fences, providing both aesthetic appeal and practical screening. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Issai bears fruit 2-4 years after planting. Harvest fruits in late August through October when they yield slightly to pressure and are intensely fragrant. Pick when fully ripe on the vine for best flavor. Fruits do not ripen significantly after harvest. Each mature vine can produce 50-100+ pounds of fruit annually.
Fun Facts
- 🌱 Issai is notably self-fertile, unlike many kiwifruit varieties, making it the ideal choice for home gardeners with limited space who want guaranteed fruit production without needing a separate pollinator plant.
- 🌱 The berries can be eaten directly from the vine without peeling, similar to grapes, which is why hardy kiwis are sometimes called 'kiwi berries' or 'dessert kiwis'—a major advantage over fuzzy kiwis that require peeling.
- 🌱 A single mature Issai vine can produce over 100 pounds of fruit annually under good conditions, making it one of the most productive fruit plants a home gardener can grow per square foot of space.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Issai Kiwifruit planting timeline
Tell us your zip code and we'll calculate exactly when to start Issai Kiwifruit seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Issai Kiwifruit timeline →