Learning how to grow kiwi berries is a rewarding project for any home gardener. Growing kiwi berries, the grape-sized cousins of fuzzy kiwis, requires patience and the right pairing of male and female plants. These sweet, smooth-skinned fruits are hardy and productive once established, offering a unique harvest from your own backyard.
This guide provides clear, step-by-step instructions. We will cover everything from selecting plants to harvesting your first crop.
You can succeed with these vigorous vines.
How To Grow Kiwi Berries
Success starts with understanding the plant’s basic needs. Kiwi berries belong to the Actinidia genus, primarily Actinidia arguta (hardy kiwi) and Actinidia kolomikta (arctic kiwi). They are deciduous, perennial vines that need strong support and several years to begin fruiting.
Unlike their fuzzy supermarket relatives, kiwi berries have edible, smooth skin and mature to the size of a large grape. They are notably cold-hardy, with some varieties surviving temperatures as low as -25°F to -40°F. The key to fruit is planting both a male and a female plant, as they are dioecious.
Choosing The Right Kiwi Berry Variety
Selecting a variety suited to your climate is the first critical step. Consider your USDA Hardiness Zone and the length of your growing season. Some varieties fruit earlier or are more tolerant of summer heat.
Here are some popular and reliable kiwi berry varieties to consider:
- Anna: A self-fertile female variety, an exception to the rule. It produces good yields without a separate male pollinator, though one can improve fruit set. Good for smaller gardens.
- Issai: Another partially self-fertile variety, but often benefits from cross-pollination. It is a compact grower and can start fruiting sooner than other types, sometimes within a year or two.
- Ken’s Red: A female variety known for its beautiful red-blushed skin and sweet flavor. It requires a male pollinator, such as ‘Male’ or ‘Meader Male’.
- Geneva: A female hardy kiwi (A. arguta) prized for its early ripening and large, sweet fruit. It needs a male pollinator.
- Arctic Beauty (A. kolomikta): Known for its stunning pink and white variegated leaves on male plants. The fruits are smaller but incredibly sweet. It is the most cold-tolerant species. Females like ‘Krupnopladnaya’ need a male arctic beauty for pollination.
Remember, for most varieties, you need at least one male plant for every four to eight female vines. Ensure the male and female plants are of the same species (arguta with arguta, kolomikta with kolomikta) to ensure compatability.
Site Selection And Soil Preparation
Kiwi berry vines will live for decades, so proper site selection is a long-term investment. They need full sun for at least six to eight hours daily to produce the sweetest fruit and promote strong growth. A sheltered location that protects young vines from strong, drying winds is also ideal.
Soil is paramount. Kiwi berries demand well-draining soil. They will not tolerate “wet feet,” which leads to root rot. A slightly acidic to neutral pH between 5.5 and 7.0 is perfect.
Preparing Your Planting Site
- Test Your Soil: A simple soil test will reveal your pH and nutrient levels. Amend as needed based on the results.
- Improve Drainage: If you have heavy clay soil, amend it deeply with generous amounts of compost, well-rotted manure, or coconut coir. Raised beds are an excellent solution for poor drainage.
- Clear The Area: Remove all grass, weeds, and debris from a planting area at least 4 feet in diameter for each vine. These vines are heavy feeders and don’t compete well with grass or weeds for nutrients and water.
Planting Your Kiwi Berry Vines
The best time to plant bare-root kiwi berries is in early spring, while the plants are still dormant. Container-grown plants can be planted in spring or early fall, giving them time to establish roots before extreme weather.
- Dig a Hole: Make the planting hole twice as wide and just as deep as the root ball or container. Roughen the sides of the hole to help roots penetrate the native soil.
- Position the Vine: Place the vine in the hole, ensuring the soil line on the stem matches the surrounding ground level. Do not plant it deeper than it was growing in the nursery.
- Backfill and Water: Backfill the hole with the native soil mixed with some compost. Gently firm the soil around the roots to eliminate large air pockets. Water thoroughly to settle the soil.
- Mulch: Apply a 3- to 4-inch layer of organic mulch, like wood chips or straw, around the base of the plant. Keep the mulch a few inches away from the main stem to prevent rot.
- Spacing: Space vines 10 to 15 feet apart. They will fill this space over time. Remember to plant your male vine within 50 feet of the female vines for effective pollination.
Building A Strong Support Structure
Kiwi berries are vigorous, woody vines that cannot support their own weight. A strong, permanent support structure is non-negotiable. A T-trellis system is the most common and effective method.
To build a simple T-trellis, set sturdy posts (like 4×4 treated lumber or metal posts) at least 8 feet tall and 15 to 20 feet apart. Secure a horizontal crossbar (a 2×4 or metal pipe) across the top of each post, creating a “T” shape. Run high-tensile wire along the ends of the crossbars and down the posts. The vines will be trained to grow up a central trunk and then along these horizontal wires.
An existing sturdy pergola or arbor can also work beautifully, providing both support and ornamental value. Ensure whatever structure you choose can handle hundreds of pounds of mature vine growth and fruit.
Watering And Fertilizing Schedule
Consistent moisture is crucial, especially in the first three years and during fruit development. Kiwi berries have shallow root systems and can suffer from drought stress.
- Year 1: Water deeply 2-3 times per week, providing 1-2 gallons per vine, unless rainfall is adequate. The goal is to keep the soil consistently moist but not soggy.
- Established Vines: Water deeply once a week during dry periods. Drip irrigation or soaker hoses are ideal for delivering water directly to the root zone.
- Fertilizing: In early spring, as new growth begins, apply a balanced fertilizer (like a 10-10-10). Follow the package instructions based on the age and size of your vine. A second application in early summer can be beneficial. Avoid fertilizing after mid-summer, as this can encourage late, tender growth susceptible to winter damage.
An annual top-dressing of compost around the base of the vine in spring is an excellent way to provide slow-release nutrients and improve soil health.
Pruning And Training For Maximum Yield
Pruning is essential for managing growth, maintaining the structure, and encouraging fruit production. There are two main pruning times: winter (dormant) and summer.
Dormant Pruning (Late Winter)
This is the major structural prune. The goal is to select and renew fruiting wood.
- Identify the main permanent cordons (arms) trained along your support wires.
- From these cordons, shorter lateral branches will grow. Fruit is produced on the current season’s growth that emerges from these laterals.
- During dormancy, prune back these laterals to about 8 to 12 buds from their base. This stimulates strong, fruitful new shoots in spring.
- Remove any dead, diseased, or damaged wood, as well as any tangled or overcrowded growth.
Summer Pruning
Summer pruning controls vigor and directs energy to the fruit. Simply tip-prune (pinch back) long, whippy shoots that are not needed for structure. This helps keep the vine open to light and air, reducing disease risk.
Pollination Requirements
This is a point where many new growers make a mistake. As mentioned, most kiwi berry plants are either male or female. Only female plants produce fruit, but they require a male plant to provide pollen.
One male vine can pollinate up to eight female vines, as long as they flower at the same time. Bees are the primary pollinators. To ensure success, plant your male vine upwind from your females if possible, and avoid using insecticides during the bloom period. The flowers are not particularly showy but are fragrant and attractive to bees.
If you only have space for one vine, you must choose a self-fertile variety like ‘Issai’ or ‘Anna’. Their fruit production is often more reliable with a partner, but they will set a crop alone.
Pest And Disease Management
Kiwi berries are relatively trouble-free, but a few issues can occur.
- Root Rot: Caused by waterlogged soil. Prevent it by ensuring excellent drainage at planting and avoiding overwatering.
- Botrytis (Gray Mold): A fungal issue in humid, crowded conditions. Improve air circulation through proper pruning and spacing.
- Japanese Beetles & Leafrollers: These insects may chew on leaves. Hand-pick beetles in the early morning or use pheromone traps placed away from your vines. Leafroller damage is usually minor.
- Cats: Surprisingly, young A. kolomikta vines can attract cats who may damage the stems. Use a protective barrier like chicken wire around the base of young plants if this becomes a problem.
Healthy, well-cared-for vines are the best defense against most problems.
Harvesting And Storing Your Crop
Patience is key. Kiwi berry vines typically take 3 to 5 years to produce a significant harvest. The fruit ripens in late summer to early fall, depending on your climate and variety.
Fruits do not ripen all at once. They are ready to pick when they have reached their full color (green, purplish, or red-blushed, depending on variety) and are slightly soft to the touch. The best test is a taste test—pick a few and see if they are sweet.
You can also harvest firm fruit and ripen it indoors at room temperature in a paper bag with a banana or apple, which release ethylene gas. Once ripe, store kiwi berries in the refrigerator for up to several weeks. They are perfect for eating fresh, adding to fruit salads, or making into jams and desserts.
Overwintering Your Kiwi Berry Vines
Mature, dormant vines of hardy varieties are very cold-tolerant. However, late spring frosts can damage new growth and flower buds. To protect against this, avoid planting in frost pockets.
For young vines in their first couple of winters, you can provide extra protection by mounding mulch or straw around the base of the plant. In very cold regions, some gardeners gently wrap the main trunk with burlap or tree wrap to prevent sunscald and frost cracking.
Common Problems And Solutions
Even with the best care, you might encounter a few challenges.
- Vine is Not Fruiting: The most common cause is lack of a pollinator. Ensure you have a compatible male vine nearby. Other causes include pruning off all fruiting wood, excessive shade, or the vine simply being too young.
- Poor Growth: Check soil drainage and pH. Compacted, waterlogged, or highly alkaline soil will stunt growth. Ensure the vine is receiving enough water and sunlight.
- Leaf Discoloration: Yellowing leaves (chlorosis) is often a sign of high soil pH (alkaline soil), which locks up iron. A soil test will confirm this; amending with sulfur or using a chelated iron supplement can help.
Frequently Asked Questions
How long does it take for a kiwi berry plant to produce fruit?
Most kiwi berry vines will take 3 to 5 years to produce their first significant harvest. Some self-fertile varieties like ‘Issai’ may fruit a bit sooner, sometimes in year 2.
Can you grow kiwi berries in containers?
Yes, it is possible, especially with the more compact, self-fertile varieties. Use a very large container (at least 20 gallons) with excellent drainage, provide a strong trellis, and be diligent with watering and fertilizing. Growth and yield will be more limited than in-ground planting.
What is the difference between a kiwi berry and a hardy kiwi?
The terms are often used interchangeably. Technically, the small, smooth-skinned fruit is the kiwi berry. “Hardy kiwi” typically refers to the plant species (Actinidia arguta) that produces them, distinguishing it from the fuzzy, tender commercial kiwi (Actinidia deliciosa).
Do kiwi berries need a trellis?
Absolutely. They are vigorous climbing vines that require a strong, permanent support structure like a T-trellis, pergola, or arbor to grow properly and produce a good crop. They cannot stand alone.
When is the best time to prune kiwi berries?
The main pruning should be done in late winter while the plant is dormant. Supplemental summer pruning is helpful to manage excessive vegetative growth and improve air circulation around the developing fruit.