Cool 07 Broccoli

layout: base.njk title: "Broccoli" plantName: "Brassica oleracea var. italica" category: "Cool Season Crops" description: "Growing guide for Broccoli in West Virginia Zone 6b/7a" tags: planting-guide

Type: Biennial (grown as annual)
Family: Brassicaceae (Cruciferae)
Sun: Full sun (6+ hours, essential for good head formation)
Water: High (1.5-2" per week, consistent moisture critical)
Soil pH: 6.0-7.0 (optimal 6.5-6.8)
Hardiness: Zones 3-10 (cool season annual, moderate cold tolerance)

📅 Planting Calendar (WV Zone 6b/7a)

Method	Timing	Notes
Start indoors	February 1 - March 15 (spring); June 15 - July 15 (fall)	Spring: 6-8 weeks before last frost. Fall: 10-12 weeks before first frost. Sow 1/4" deep at 65-75°F. Germination in 5-10 days. Bottom heat speeds germination.
Direct sow	March 15 - April 30 (spring); July 15 - August 1 (fall)	Soil temp 50-85°F. Sow 1/2" deep, thin to 18-24". Less reliable than transplants. Fall crop often superior.
Transplant	March 25 - May 10 (spring); August 15 - September 15 (fall)	Harden off 7-10 days (critical). Space 18-24" apart. Tolerates light frost (down to mid-20s°F). Fall transplants tolerate more cold.
Days to maturity	60-90 days	Early: 60-70 days. Mid-season: 70-80 days. Late: 80-90 days. From transplant. Harvest when buds tight, before flowering.
Succession plant	Plant early and late varieties	Spring and fall crops. Summer heat causes poor heading. Fall broccoli often sweeter and higher quality.

🌱 Expected Yield

Per plant: Main head: 0.5-1.5 lbs. Side shoots (after main harvest): 0.5-1 lb additional over 3-6 weeks.
Per 10' row: 10-20 lbs main heads. 5-10 lbs side shoots (with continued harvest).
Per season: With spring and fall crops: 20-40 lbs per 10' row annually.

🌿 Growing Conditions

Soil: Well-drained, fertile loam high in organic matter. Broccoli is heavy feeder. Firm soil promotes tight heads. pH 6.5-6.8 optimal (prevents clubroot). If soil is acidic, apply wood ash lightly or let cover crops balance pH naturally. Prevent clubroot through 7-year rotation and resistant varieties. Amend with 4" compost before planting. Raised beds recommended for drainage.
Fertilizer: Heavy feeder, especially nitrogen and boron. Apply composted manure or extra compost (1-2 inches) at planting. Side-dress with blood meal or fish emulsion 3 weeks after transplant and when heads begin forming. For phosphorus, add bone meal at planting (2-3 tbsp per 10' row). Boron deficiency causes hollow stem—apply composted manure or kelp meal.
Companions: Excellent with onions, dill, rosemary, sage, thyme, mint, potatoes, celery, beets. Strong herbs mask broccoli scent from moths. Dill attracts wasps that eat cabbage worms. Avoid planting with strawberries.
Avoid: Plant away from strawberries, tomatoes, pole beans, grapes. Rotate 3-4 years away from other brassicas (cabbage, cauliflower, kale, Brussels sprouts) to prevent disease.
Pests: Cabbage worms/imported cabbage moths (Bt, row covers—essential for organic control), cabbage loopers (Bt, beneficial wasps), aphids (hose off, insecticidal soap, ladybugs), flea beetles (row covers for transplants), cabbage root maggots (row covers, beneficial nematodes).
Diseases: Clubroot (most serious—raise pH to 7.2+, 7-year rotation, resistant varieties), black rot (bacterial—rotate, avoid overhead watering), alternaria leaf spot (remove affected leaves), downy mildew (improve airflow), powdery mildew (improve circulation). Prevent buttoning (tiny heads) by avoiding transplant shock, providing consistent moisture and fertility.

🏺 Heirloom Varieties (5-10+)

'Calabrese'

Source: Seed Savers Exchange, Baker Creek Heirloom Seeds (rareseeds.com), Johnny's Selected Seeds (johnnyseeds.com)
Days: 65 days
Notes: Italian heirloom, standard broccoli in America. Large central head (4-6" diameter), abundant side shoots. Blue-green heads. Cold tolerant. Reliable producer. Introduced to America by Italian immigrants. Standard for home gardens.

'Waltham 29'

Source: Seed Savers Exchange, Baker Creek, Johnny's Selected Seeds
Days: 65 days
Notes: Developed at University of Massachusetts (Waltham) in 1950s. Dense, blue-green heads. Excellent side shoot production. Cold tolerant. Disease resistant. Revolutionized American broccoli production. Reliable, productive.

'DeCicco'

Source: Seed Savers Exchange, Baker Creek, Johnny's Selected Seeds, Southern Exposure Seed Exchange (southernexposure.com)
Days: 55 days
Notes: Italian heirloom from 1880s. Early maturing. Produces many small side shoots rather than one large head. Continuous harvest over 4-6 weeks. Cold tolerant. Self-sows. Sprouting broccoli type. Excellent for extended harvest.

'Purple Sprouting'

Source: Seed Savers Exchange, Baker Creek, Southern Exposure
Days: 70 days
Notes: Heirloom sprouting type. Purple-tinged heads and spears. Sweet, tender. Cold hardy—often overwintered for spring harvest. Beautiful ornamental value. Sprouting habit (many small heads) rather than single large head. Delicious, visually striking.

'Romanesco'

Source: Baker Creek, Seed Savers Exchange, Johnny's Selected Seeds
Days: 75 days
Notes: Italian heirloom. Lime-green fractal heads (mathematical Fibonacci spirals). Stunning appearance. Nutty, delicate flavor. More heat sensitive than regular broccoli. Conversation piece. Requires cool weather for best head formation.

'Packman'

Source: Johnny's Selected Seeds, Baker Creek
Days: 60 days
Notes: Hybrid, F1. Large, dome-shaped blue-green heads. Very early. Uniform. Heavy yielder. Good side shoots. Disease resistant. Popular with market growers. Reliable producer.

'Green Goliath'

Source: Seed Savers Exchange, Baker Creek, Johnny's Selected Seeds
Days: 65 days
Notes: Open-pollinated heirloom. Large, blue-green heads. Good side shoot production. Cold tolerant. Reliable in variable conditions. Standard for Pacific Northwest. Excellent flavor.

'Arcadia'

Source: Johnny's Selected Seeds, High Mowing Organic Seeds (highmowingseeds.com)
Days: 63 days
Notes: Hybrid, F1. Dark blue-green, large domed heads. Excellent heat tolerance for broccoli. Holds well in field. Heavy yielder. Disease resistant. Good for spring and fall. Industry standard for fresh market.

'Belstar'

Source: Johnny's Selected Seeds, Burpee (burpee.com)
Days: 62 days
Notes: Hybrid, F1. Small, round, blue-green heads. Very uniform. Excellent side shoots. Cold tolerant. Good for fall crop. Disease resistant. Reliable yielder.

'Marathon'

Source: Johnny's Selected Seeds, High Mowing Organic Seeds
Days: 68 days
Notes: Hybrid, F1. Large, blue-green heads with high domes. Excellent cold tolerance. Holds well in field. Heavy yielder. Popular for fall harvest and storage. Disease resistant. Industry standard.

📜 Cultural History & Domestication

Domesticated: Broccoli was domesticated from wild cabbage (Brassica oleracea) in the Mediterranean region over 2000 years ago. Broccoli represents selection for immature flower buds rather than leaves (kale, cabbage) or stems (kohlrabi).

Archaeological Evidence: No definitive ancient remains, but broccoli-like brassicas described in Roman texts. Likely developed through selective breeding from earlier cabbage types.

Historical Record: Ancient Romans cultivated broccoli—described by Pliny the Elder (23-79 CE) in Natural History as plant brought from Greece. The name "broccoli" derives from Italian "brocco" (shoot, sprout). Broccoli remained primarily Italian crop for centuries—Italians perfected cultivation and culinary use. Catherine de' Medici reportedly introduced broccoli to French court when she married King Henry II (1547), though this is debated. Broccoli spread through Europe via Italian influence but remained suspect in Northern Europe (too exotic). English called it "Italian asparagus" in 1700s. Thomas Jefferson grew broccoli at Monticello, importing seeds from Italy (1767). Broccoli remained rare in America until 1920s when Italian immigrants increased demand. D'Arrigo Brothers (California) began commercial broccoli production in 1920s, marketing to Italian communities. By 1930s, broccoli gained wider acceptance. Post-WWII, broccoli became mainstream American vegetable. Today California produces 90% of U.S. broccoli. Broccoli's nutritional benefits (vitamin C, fiber, glucosinolates with anti-cancer properties) widely publicized since 1980s, further increasing consumption.

Cultural Significance: Broccoli represents Italian culinary influence on global cuisine— Italians developed broccoli cooking methods still standard (steaming, sautéing, roasting). Traditional Italian preparations include broccoli rabe (rapini, slightly bitter relative), pasta con broccoli, broccoli saltato con aglio. Chinese cuisine features broccoli prominently (stir-fries, beef and broccoli American-Chinese dish). Broccoli's nutritional reputation as "superfood" elevated its status—research on sulforaphane (glucosinolate with anti-cancer properties) made broccoli poster child for disease-preventive foods. First Lady Barbara Bush famously disliked broccoli (White House banned it 1990), generating publicity. George W. Bush also famously disliked broccoli, though allowed at White House. Broccoli became symbol of healthy eating parents try to get children to eat. The tight flower buds that define broccoli represent botanical elegance— each head contains thousands of immature flower buds. If left unharvested, broccoli produces bright yellow flowers (edible, attractive to pollinators). Sprouting broccoli varieties (like DeCicco, Purple Sprouting) represent older form—many small shoots rather than one large head, providing extended harvest. These are gaining renewed interest among home growers and chefs seeking flavor diversity.

🌾 Seed Saving

Method: Broccoli is biennial—requires vernalization (cold period) to flower. For seed saving, select best plants, leave in ground over winter (mulch heavily in zone 6b, or dig and store in cool, humid place at 35-40°F), replant in spring. In spring, plants send up 3-5' flower stalks from center. Yellow, four-petaled flowers bloom over 3-4 weeks. Heavy insect pollination (bees, flies). Seed pods (siliques) mature 4-6 weeks after flowering, turning from green to tan/brown. Cut stalks when most pods brown but before shattering. Hang in paper bags or on tarps in dry, ventilated area 2-3 weeks. Thresh by beating bags or rolling stalks. Winnow by pouring between bowls in breeze to separate seeds from chaff.
Isolation distance: 2 miles minimum (up to 5 miles for pure seed). Broccoli cross-pollinates readily with all Brassica oleracea varieties (cabbage, cauliflower, kale, collards, Brussels sprouts, kohlrabi—all same species). For pure seed, grow only one B. oleracea variety or cage isolated plants with netting and hand-pollinate.
Viability: 4-5 years when stored in cool, dry, dark conditions in airtight containers. Medium-sized seeds store well.
Special notes: Save seed from minimum 5-10 plants to maintain genetic diversity. Select for head quality, disease resistance, cold tolerance, side shoot production, bolt resistance. In zone 6b/7a, hardy varieties can overwinter with heavy mulch. Less hardy varieties must be stored indoors and replanted. Some varieties bolt more easily—avoid saving seed from prematurely bolting plants. Biennial requirement means seed saving requires two full seasons. Sprouting types often easier to save seed from (more flowers, more seed).

📖 Sources Consulted

Jett, Lewis W. "2026 Garden Calendar." WVU Extension Service.
Ashworth, Suzanne. Seed to Seed: Seed Saving and Growing Techniques for Vegetable Gardeners, 2nd ed. Seed Savers Exchange, 2002.
"Growing Broccoli in the Home Garden." Ohio State University Extension, HYG-1605-08.
"Broccoli Production Manual." University of California Agriculture and Natural Resources, Publication 7213.
"Broccoli Varieties." Seed Savers Exchange Yearbook. seedsavers.org, 2025.
Baker Creek Heirloom Seeds Catalog. rareseeds.com, 2025.
Johnny's Selected Seeds Grower's Library. johnnyseeds.com, 2025.
Kiple, Kenneth F. and Kriemhild Coneè Ornelas, eds. The Cambridge World History of Food. Cambridge University Press, 2000. (Historical references)
"History of Broccoli." University of Illinois Extension. web.extension.illinois.edu.

🌾 Natural Soil Amendments (Loop Farmstead Standard)

Only on-farm, regenerative inputs:

Compost: 1-2 inches annually (on-farm production)
Cover crops: Rye + vetch (fall), buckwheat (summer), daikon (compaction)
Wood chips: Pathways only (aged 2+ years for beds)
Fall leaves: Mulch or compost browns
Blood/bone meal: From farm-slaughtered animals
Biochar: Charged with compost tea (permanent carbon)
Wood ash: Light application from wood stove
Eggshells: Crushed/powdered (slow calcium)

❌ Never used: Synthetic fertilizers, mined minerals, gypsum, peat moss

See: natural_soil_amendments_standard.md for complete guide

Added to WV Planting Guide 26155 — The Loop Farmstead