Warm 20 Nz Spinach

layout: base.njk title: "New Zealand Spinach" plantName: "Tetragonia tetragonioides" category: "Warm Season Crops" description: "Growing guide for New Zealand Spinach in West Virginia Zone 6b/7a" tags: planting-guide

Spinach plants with dark green leaves ready for harvest

Type: Annual (perennial in frost-free climates)
Family: Aizoaceae (Ice Plant Family) — not related to true spinach
Sun: Full sun to partial shade (tolerates heat better than true spinach)
Water: Moderate (1" per week; drought-tolerant once established)
Soil pH: 6.0-7.0
Hardiness: Annual in Zone 6b/7a (frost-tender, heat-loving)

📅 Planting Calendar (WV Zone 6b/7a)

Method	Timing	Notes
Start indoors	March 15 - April 1	6-8 weeks before transplant, soil temp 65-75°F, 1/4" deep
Direct sow	May 20 - June 15	After last frost, soil >60°F (ideally 65-75°F), 1/2" deep
Transplant	May 25 - June 15	After all frost danger, harden off 7-10 days
Days to maturity	50-60 days	From direct sow or transplant (harvest begins when plants are 8-10" tall)
Harvest window	June 25 - October 15	Continuous harvest through first frost; peak: July through September

🌱 Expected Yield

Per plant: 1-2 lbs of leaves (continuous harvest with regular picking)
Per 10' row: 8-15 lbs (8-10 plants)
Notes: New Zealand spinach is a prolific producer in hot weather, continuing when true spinach has bolted. Production is continuous with regular harvesting (pick outer leaves, allow center to grow). Plants spread 2-3 feet and can be harvested multiple times per week. Leaves are thicker and more succulent than true spinach, with slightly higher yield per square foot in summer heat.

🌿 Growing Conditions

Soil

Well-drained loam with moderate fertility. New Zealand spinach is adaptable to various soil types, including poor soils. Heavy clay should be amended with compost and creek sand for drainage. Raised beds warm faster, extending the season. Slightly salty or coastal soils are tolerated (reflects coastal origin).

Fertilizer

Pre-plant: 2-3" compost; moderate fertility sufficient
At planting: Light application of composted manure or compost
Side-dress: Not needed for established plants; light compost application mid-season if growth slows
Avoid: Excess nitrogen (can make leaves too tender, prone to wilting); fresh manure
Note: New Zealand spinach is a light to moderate feeder; too much fertility reduces flavor intensity

Companions

Good: Strawberries (living mulch between rows), beans (fix nitrogen), corn (partial shade in hottest weather), tomatoes (different root depths), peppers, eggplant
Avoid: None significant
Note: Spreading habit makes it excellent as living mulch between taller crops; tolerates partial shade from corn or tomatoes

Pests

Flea beetles: Can damage young plants; row covers until established; diatomaceous earth deterrent
Aphids: Uncommon (thick leaves resist); blast with water if present; introduce ladybugs
Slugs/snails: Can damage leaves in humid conditions; hand-pick; beer traps; diatomaceous earth barrier
Caterpillars: Occasional feeding; hand-pick; Bt for severe infestations
Deer: Generally avoid (thick, slightly salty leaves); fencing not usually necessary
Note: Far fewer pest problems than true spinach; thick, succulent leaves naturally resistant

Diseases

Leaf spot: Small brown spots on leaves; improve air circulation; remove affected leaves; copper spray if severe
Root rot: In poorly drained soil; improve drainage with sand and compost; raised beds help
Powdery mildew: Rare (more resistant than true spinach); ensure air circulation if it occurs
Damping off: In seedlings; use sterile seed starting mix; good air circulation
Prevention: Good drainage; air circulation; avoid overhead watering; rotate annually (though disease pressure is low)

Support

Spreading habit: Plants spread 2-3 feet; trailing/groundcover habit
Spacing: 12-18" between plants; 24-36" between rows
Mulching: Organic mulch (straw, leaves) to retain moisture and suppress weeds; black plastic for soil warming
Training: Can be allowed to spread as groundcover; can be trimmed to maintain compact habit
Note: Excellent as living mulch between rows of taller crops; self-seeds readily if allowed

🏺 Heirloom Varieties

Note: New Zealand spinach has limited varietal diversity compared to major crops. Most seed companies offer essentially the same variety, selected for regional adaptation rather than distinct genetic lines. The following represent sources and slight variations available to gardeners.

'Standard' (New Zealand Spinach)

Source: Baker Creek (rareseeds.com), Johnny's Selected Seeds (johnnyseeds.com), Southern Exposure (southernexposure.com), Park Seed, Burpee
Days: 50-60 days
Notes: This is the standard variety available from most seed companies. Triangular succulent leaves, 2-3" long. Spreading habit to 2-3 feet. Heat-tolerant. Continuous production in summer. Slightly salty, mild spinach flavor. Thick leaves hold up well to cooking.

'Tetragonia' (Botanical Selection)

Source: Baker Creek, specialist seed companies
Days: 55 days
Notes: Selected for larger leaves. More upright habit than standard. Vigorous grower. Good for cooler coastal areas. Slightly more succulent leaves.

'Australian Spinach'

Source: Southern Exposure, Australian seed companies
Days: 55 days
Notes: Australian selection. Similar to standard. May have slightly larger leaves. Adapted to hot, humid conditions. Vigorous producer.

'Cook's Spinach'

Source: Seed Savers Exchange (seedsavers.org), heritage seed collectors
Days: 50 days
Notes: Early maturing selection. Smaller leaves. More compact habit. Good for small gardens. Early production.

'Giant Leaved'

Source: Baker Creek, specialty seed companies
Days: 60 days
Notes: Selected for extra-large leaves (4-5" long). More upright growth. Slower to bolt. Higher yield per plant. Requires longer season.

'Dwarf'

Source: Specialty seed companies, heritage collections
Days: 45 days
Notes: Compact habit (12-18" spread). Smaller leaves. Good for containers, small gardens. Early production. Less vigorous than standard.

'Wild Type' (Foraged/Coastal)

Source: Coastal foraging, Seed Savers Exchange
Days: 55 days
Notes: Collected from coastal populations (California, Australia, New Zealand). More variable. Often more salt-tolerant. Smaller leaves. Adapted to local conditions. Genetic diversity.

'Jersey Kale Spinach'

Source: Seed Savers Exchange, UK heritage seed organizations
Days: 55 days
Notes: UK selection. Slightly more cold-tolerant. Good for maritime climates. Moderate leaf size. Traditional variety.

'Pacific Coast'

Source: West Coast seed companies, Seed Savers Exchange
Days: 50 days
Notes: Selected from California coastal populations. Heat-tolerant. Drought-resistant. Moderate leaf size. Vigorous.

'South Pacific'

Source: Pacific Island seed companies, specialty sources
Days: 55 days
Notes: Polynesian introduction. Traditional Pacific Island variety. Vigorous. Heat and humidity tolerant. Cultural significance.

Variety Note: Unlike crops with hundreds of heirloom varieties, New Zealand spinach has limited named diversity. The species itself is genetically uniform across its range. Seed savers are encouraged to select their own locally-adapted lines by saving seed from plants that perform best in their specific conditions (heat tolerance, disease resistance, leaf size, flavor).

📜 Cultural History & Domestication

Domesticated: New Zealand spinach was not domesticated in the traditional sense but rather collected from wild coastal populations. It is native to coastal regions around the Pacific Rim, including New Zealand, Australia, Japan, Korea, China, and the west coasts of North and South America. The plant evolved as a coastal species, tolerant of salt spray, sandy soils, and maritime climates.

Historical Record: The first written description of New Zealand spinach comes from Captain James Cook's voyages (1768-1771). Cook's botanist, Sir Joseph Banks, collected the plant in New Zealand in 1769. The species was named Tetragonia tetragonioides (formerly Tetragonia expansa) based on these collections.

Captain Cook's Discovery: Cook's crews used New Zealand spinach as an antiscorbutic (scurvy prevention) during their long Pacific voyages. The thick, succulent leaves are high in vitamins A and C, making them valuable for sailors who lacked fresh vegetables for months at a time. Cook reportedly ordered his crews to collect and eat the plant whenever they landed in regions where it grew.

Spread to Europe: Seeds were brought back to England by Banks and introduced to Kew Gardens in 1772. From England, New Zealand spinach spread throughout Europe. By the early 1800s, it was grown in France, Germany, and Italy as a summer spinach substitute. European gardeners valued it for heat tolerance—true spinach bolts quickly in summer heat, but New Zealand spinach thrives.

Introduction to America: New Zealand spinach arrived in colonial America by the late 1700s. Thomas Jefferson grew it at Monticello, noting in his garden records (1809) that it was "superior to common spinach in summer." It became common in American kitchen gardens during the 1800s, particularly in Southern states where summer heat prevented true spinach production.

World War Era: During both World Wars, New Zealand spinach gained renewed attention as a "victory garden" crop. Its ease of cultivation, heat tolerance, and high nutritional value made it ideal for home food production. Victory garden pamphlets from WWII specifically recommended New Zealand spinach for summer production.

Decline and Revival: After WWII, New Zealand spinach declined in popularity with the rise of commercial agriculture focused on true spinach (which ships and processes better). By the 1970s, it was rare in American gardens, preserved mainly by seed savers and heirloom gardeners.

The heirloom seed movement and interest in heat-tolerant, climate-resilient crops has renewed interest in New Zealand spinach since the 1990s. Gardeners facing hotter summers appreciate its reliability. Chefs value its thicker leaves and slightly different flavor for culinary use.

Indigenous Uses: While not "domesticated" by indigenous peoples, coastal Aboriginal Australians and Māori in New Zealand collected wild New Zealand spinach as food. The thick leaves were eaten raw or cooked. The plant's year-round availability in coastal areas made it a reliable food source.

Global Distribution: Today, New Zealand spinach is grown in warm climates worldwide. It is particularly popular in: - Japan: Called komatsuna (though this name also applies to related species), used in tempura and stir-fries - Australia: Common in home gardens, sold at farmers markets - California: Grown commercially for specialty markets - Mediterranean: Increasing cultivation as summers warm

Why It Matters: New Zealand spinach represents an underutilized crop with significant potential for climate adaptation. As summers become hotter and drier in many regions, crops that thrive in heat and drought become increasingly valuable. New Zealand spinach produces reliably when true spinach fails, extends the "spinach" season by 3-4 months, and requires fewer inputs (water, pest management) than true spinach.

Culinary Note: The leaves are thicker and more succulent than true spinach, with a slightly salty, mild flavor. They hold up well to cooking and don't reduce in volume as dramatically as true spinach. Young leaves can be eaten raw in salads; older leaves are best cooked (steamed, sautéed, or added to soups). The plant contains oxalates like true spinach (similar levels), so those with kidney stone issues should consume in moderation.

Botanical Note: Despite the common name, New Zealand spinach is not related to true spinach (Spinacia oleracea, family Amaranthaceae). It belongs to the Aizoaceae (ice plant family), which includes many succulent species. The triangular, succulent leaves and spreading habit reflect this ancestry. The small yellow flowers are followed by hard, spiny seed pods characteristic of the ice plant family.

🌾 Seed Saving

Method: 1. Choose healthy, vigorous plants with desirable characteristics (large leaves, good flavor, heat tolerance) 2. Allow selected plants to flower (small yellow flowers appear in leaf axils from mid-summer onward) 3. Flowers self-pollinate; seeds form in hard, spiny pods 4. Pods mature over 3-4 weeks, turning from green to brown/tan 5. Harvest seed pods when completely dry and brown (can harvest individual pods or whole branches) 6. Place dried pods in paper bag; crush to release seeds 7. Separate seeds from chaff by winnowing (pour between containers outdoors; wind blows chaff away) 8. Seeds are hard, irregular, brownish; store in paper envelope or glass jar in cool, dry place

Isolation Distance: - Self-pollinating: New Zealand spinach flowers are primarily self-pollinating - Minimum: 50-100 feet between plants grown for seed (to maintain distinct lines) - For purity: 1/4 mile (though crossing is rare due to self-pollination) - Note: Only one variety exists commercially; isolation mainly needed if saving from wild collections or distinct selections

Viability: 4-6 years under proper storage (cool, dry, dark). Seed coat is hard, providing good protection. Germination rates remain high through year 4.

Special Notes: - Save from 5-10 plants minimum to maintain genetic diversity - Select for heat tolerance (plants that continue producing in hottest weather) - Select for leaf size and flavor (taste leaves from candidate plants) - Select for bolting resistance (plants that delay flowering longest) - Seed dormancy: Fresh seed may have slight dormancy; germination improves after 6 months storage - Scarification: Lightly nicking seed coat can improve germination for old seed - Seed pods: The hard, spiny pods protect seeds well; leave pods intact until ready to process

📖 Sources Consulted

The Heirloom Vegetable Garden - Susan Belsinger and Driessle (Rodale, 2020)
Uncommon Vegetables: A Gardener's Guide - William Woys Weaver (Ten Speed Press, 2018)
Captain Cook's Florilegium - British Museum (1973 facsimile)
Seed Savers Exchange Yearbook (2020-2025 editions)
Baker Creek Heirloom Seeds Catalog (2025)
Southern Exposure Seed Exchange Catalog (2025)
WVU Extension Service: Alternative Spinaches (2024)
ATTRA Sustainable Agriculture: Alternative Leafy Greens (NCAT, 2023)
Thomas Jefferson's Garden Book - Edwin Morris Betts (editor) (American Philosophical Society, 1944)
Plants for a Future Database - Ken Fern (1997-2025)

Added to WV Planting Guide 26155 — The Loop Farmstead

🐺🌿🥬