How to Grow Jade Cross Broccoli

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Jade Cross Broccoli

Brassica oleracea var. italica

vegetable

Jade Cross is a classic F1 hybrid broccoli variety known for producing large, dense green head clusters with excellent uniformity and high yields. It's a reliable cold-hardy cultivar that has been a gardener favorite since the 1970s, valued for its early maturity and consistent performance.

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Example Jade Cross Broccoli timeline · Pittsburgh, PA (Zone 6b)

Plant Jade Cross Broccoli
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Jade Cross Broccoli
Around Jun 11

≈ 55 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Jade Cross Broccoli dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours daily minimum

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Water: Consistent moisture; 1-1.5 inches per week. Keep soil evenly moist but not waterlogged. Inconsistent watering can cause bitter flavor and hollow stems.

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Spacing: 18-24 inches

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Days to maturity: 55-70 days from transplant

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Planting depth: 0.25-0.5 inches for seeds; transplant at 4-6 leaf stage

Soil

Type: Well-draining loamy soil rich in organic matter

pH: 6.0-7.5

Amendments:

Compost aged manure bone meal kelp meal

Growing Zones

Find your zone →

Thrives in zones 3-9; excellent cool-season performer

3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b

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Growth Stages

Seedling

2-3 weeks

Tiny green cotyledons emerge; first true leaves appear small and serrated

Keep soil moist but not soggy. Provide bright light (grow lights if indoors). Maintain 65-70°F temperature. Thin to strongest seedling per cell.

Vegetative Growth

3-4 weeks

Develops 4-6 true leaves; plant becomes sturdy with thickening stem. Plant can be transplanted outdoors when 4-6 inches tall.

Harden off seedlings gradually before transplanting. Space 18-24 inches apart. Water consistently. Apply 2-3 inches of mulch around base. Side-dress with compost at transplant.

Head Development

3-4 weeks

Central head cluster forms as tight, densely packed green florets. Side shoots begin emerging from leaf axils.

Maintain steady watering and nutrients. Apply balanced or slightly nitrogen-rich fertilizer every 2-3 weeks. Monitor for cabbage worms and aphids. Jade Cross is cold-hardy; light frosts improve sweetness.

Head Maturation

1-2 weeks

Central head reaches full size (4-6 inches diameter), dark green color, with tightly clustered florets showing no yellowing or flowering.

Harvest when heads are firm and florets are tightly budded but before florets begin to open. Cut main head in morning when plants are crisp from dew.

Secondary Shoots

2-4 weeks

After main head removal, smaller side shoots develop from leaf axils along the stem, extending harvest season.

Continue watering and light feeding. Harvest side shoots when 3-5 inches long before florets flower. Regular harvesting encourages more side shoot production.

Companion Planting

Plan your garden →

Plant with:

Beets Carrots Celery Chamomile Dill Garlic Lettuce Onions Potatoes Spinach Thyme Mint

Avoid planting near:

Beans Cabbage family crops (if disease present) Fennel Strawberries Tomatoes Turnips

Common Pests

Row covers in early season; hand-pick caterpillars; Bacillus thuringiensis (Bt) spray; neem oil. Plant dill and fennel to attract parasitic wasps.
Same as cabbage worm; inspect undersides of leaves; Bt spray effective if applied early
Strong water spray to dislodge; insecticidal soap; neem oil; encourage ladybugs and lacewings with flowering companion plants
Row covers on seedlings; diatomaceous earth; neem oil; reflective mulch; remove debris where they overwinter
Crop rotation (3-4 years); improve soil drainage; raise soil pH above 7.2 with lime; plant resistant varieties; avoid infected soil

Uses

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Fresh eating & cooking

Culinary

Jade Cross broccoli is versatile in the kitchen—excellent steamed, roasted, stir-fried, or eaten raw in salads. The dense florets hold seasonings well and develop a slightly sweet, nutty flavor when roasted. [source]

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Freezing & preservation

Culinary

One of the best broccoli varieties for home freezing due to uniform head size and floret density. Blanch, cool in ice water, and freeze for excellent texture retention. [source]

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Nutritional & cancer prevention

Medicinal

Rich in sulforaphane, a compound with potential anti-cancer properties, plus vitamins C and K, folate, and fiber. Broccoli supports bone health, immune function, and detoxification. [source]

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Seed saving & breeding

Household

Jade Cross is an F1 hybrid, so seeds won't breed true; however, it's a classic variety for home gardeners to observe pollination and seed production on self-sown plants in cool climates. [source]

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Pollinator & beneficial insect support

Wildlife

If allowed to bolt and flower (small yellow flowers), broccoli provides important early or late-season nectar for bees and beneficial insects. Side shoots that flower support pollinators. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest the central head when 4-6 inches in diameter with tightly clustered, unopened florets and dark green color. Cut 6-8 inches below the head with sharp knife. Harvest in early morning for best quality. After main head removal, side shoots will develop and can be harvested individually when 3-5 inches long over 2-4 weeks. Jade Cross is excellent for continuous harvest in cool seasons.

Fun Facts

🌱 Jade Cross was developed by Cornell University in the 1970s and named for its jade-green color and the cross-breeding technique used to create this F1 hybrid. It revolutionized home broccoli growing with its uniformity and reliability.
🌱 Broccoli is technically an immature flower head (inflorescence)—harvesting before flowers bloom is key to tender, sweet broccoli. If left unharvested, the small yellow flowers attract beneficial parasitic wasps and pollinators.
🌱 Jade Cross broccoli tastes sweeter after a light frost, as cool temperatures convert starches to sugars. Many gardeners time fall crops to mature just before the first freeze for optimal sweetness.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Compost Cultivar Full Sun Hybrid Mulch pH Transplant True Leaves

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