Kiwi / Kiwifruit (Actinidia deliciosa / Actinidia arguta) growing guide

Quick facts

Category: fruiting
Difficulty: intermediate
Days to harvest: 1095 to 1825 days
Harvest type: continuous production over weeks or months
Spacing: 480 cm between plants

Environment

Temperature: -30–32°C
pH: 5.5 to 7
EC (hydroponic): 1.2 to 1.8 mS/cm
Daily light: 22 to 34 mol/m²/day

Climate and zones

USDA zones: 4 to 9 (winter low around -34°C or warmer)
Frost tolerance: very hardy (survives deep cold)
Season: warm (summer crops, frost-sensitive)

Viable growing environments:

outdoor year-round (in zone)

USDA zone bounds reflect outdoor year-round survival. Anywhere outside the bounded zone range, this crop still grows as an annual in the warm months (outdoor_seasonal), under cover (greenhouse), or indoors under lights.

Growing systems

Kiwi works in:

soil bed

Root mass is very heavy - thin-channel systems (NFT, vertical towers) can't hold this crop mechanically, hence the system list above.

Growing media

The substrate the roots sit in. Choice depends on the system (clay pebbles don't fit NFT channels; rockwool isn't used in media beds) and the crop (kiwi works in the media listed below).

Medium	pH effect	Water retention	Bacterial surface
Soil-based mix (Potting soil)	varies by source	high	high

Bacterial surface area matters for aquaponics: clay pebbles, lava rock, and pumice double as biofilter substrate. Low-surface media (rockwool, perlite, pea gravel) work in hydroponics but need a separate biofilter in aquaponics.

Nutrient demand by stage

NPK ratios are relative weights at each growth stage; the nutrient mix calculator scales them to absolute grams or ml. EC targets shift through the plant's life: seedlings need a much lighter solution than fruiting adults.

Stage	N	P	K	EC target (mS/cm)
seedling	1	1	1	0.8
vegetative	2	1	2	1.4
flowering	1	1	3	1.6
fruiting	1	1	3	1.5

Companion-growing notes

High transpiration. Reservoir level will need regular top-ups during fruiting or flowering.

Aquaponics suitability

Not recommended for pure aquaponics. Fish waste alone doesn't provide enough of the nutrients this crop demands (typically potassium, calcium, or boron). It can be grown in a hybrid system where the reservoir is supplemented with hydroponic-style nutrients, but expect to dose actively.

Care notes

A large vine crop requiring substantial outdoor infrastructure. Strong trellis or pergola system (T-bar or overhead arbor, supporting 3–6 m of vine spread). Large container (60 L) or in-ground planting. EC 1.5-2.5 mS/cm. pH 5.5-6.5 (prefers slightly acidic conditions). Temperature: A. deliciosa is hardy to about -10°C; A. arguta (hardy kiwi) survives -30°C. Chilling requirement: 400-800 hours below 7°C for common kiwi. Full sun (DLI 18-25 mol/m2/day). Cross-pollination is required: plant at least one male vine alongside females. Fruiting begins at 3-5 years from nursery stock. Each mature female vine produces 20–50 kg of fruit. Pruning is essential: kiwi vines are extremely vigorous and become unmanageable without regular summer and winter pruning. For aquaponics integration, kiwi vines trained on a pergola over an outdoor system provide fruit, shade, and attractive foliage. Hardy kiwiberry (A. arguta) is the more practical choice for small spaces because the vine is somewhat less aggressive and the berries don't need peeling.

Notable varieties

A starting shortlist of cultivars worth knowing about. Not exhaustive: the seed catalogs list hundreds of named varieties. These are the ones home growers commonly choose between.

Cultivar	Type	Days	Notes
Hayward (fuzzy)	open-pollinated	1825	1924 New Zealand selection, the worldwide commercial kiwi standard. Large oval fuzzy brown fruit, bright green flesh, sweet-tart. Zones 7-9. Female, needs Matua or Tomuri male pollinator. 200-day frost-free growing season required to ripen.
Anna (hardy)	open-pollinated	1095	Hardy kiwi female, the most-grown A. arguta cultivar. Grape-sized smooth green fruit, eat skin and all. Zones 4-7. Needs a male hardy-kiwi pollinator (Meader male is common). Heavy producer, 25-50 kg per mature vine.
Issai (hardy, self-fertile)	open-pollinated	1095	Japanese hardy kiwi, the only self-fertile commercially-available cultivar. Smaller fruit, lower yield than Anna, fruits in year 2-3 vs 4-5. Zones 5-8. The kiwi for someone who only has room for one plant. Heat and humidity tolerant.
Ken's Red (hardy)	open-pollinated	1095	Actinidia arguta var. purpurea, red-fleshed hardy kiwi cultivar from New Zealand breeder Ken Pittock. Striking color, sweeter than green hardy kiwi. Zones 5-8. Female, needs male pollinator. Mostly grown for novelty and direct-market sales.
Arctic Beauty (A. kolomikta)	open-pollinated	1095	Different species entirely, zone 3 hardy to -40C. Variegated pink-white-green foliage makes it ornamental. Smaller fruit than A. arguta, but the only kiwi that fruits in zone 3-4. The Russian Far East species, useful for serious northern gardens.