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How to Grow Broccoli from Seed

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Whether you are a beginner or an experienced gardener, this guide will teach you how to cultivate flavorful broccoli from seed. You will learn the essential steps of soil preparation, indoor sowing, and the hardening-off process to ensure your seedlings thrive. Follow these instructions to successfully grow a healthy, productive harvest in your own backyard.

Safety Warnings

  • When applying fertilizer, follow label instructions and wear gloves to avoid skin contact.

Tools Needed

Seed-starting tray — Plastic grow flat or tray with individual cells and drainage holes
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Pruning shears — Clean, sharp scissors or a sharp kitchen knife
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Materials

Broccoli seeds — Variety choice: Waltham 29, Imperial, De Cicco, Bonarda, Burgundy, or Romanesco(1 packet)
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Seed-starting mix — Sterile, light and airy medium(As needed)
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Balanced fertilizer — Low-nitrogen, all-purpose garden or vegetable fertilizer(As needed)
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Compost — Organic matter for soil enrichment(As needed)
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Steps

1
Prepare the soil in a raised bed or vegetable bed. Ensure the soil is well-draining, enriched with compost, and has a slightly acidic to neutral pH between 6 and 7. Select a full-sun location that provides 6 to 8 hours of sunlight daily.
2
Sow seeds indoors 4 to 6 weeks before the last frost date. Use a sterile seed-starting mix and maintain an average temperature of 75 degrees Fahrenheit for germination. Keep the soil evenly moist.
3
Once seedlings are ready, harden them off by placing them outdoors for a few hours each day for 2 to 4 weeks leading up to the last frost. If planting for a fall harvest, seeds can be sown directly in the ground in midsummer.
4
Transplant seedlings into the garden, spacing them 1.5 to 2 feet apart in rows that are 3 feet apart. If using containers, limit growth to one plant per 5-gallon container.
1.5–2 ft Set seedling Dig hole first Hardened plant Top-down view · Maintain spacing to ensure adequate airflow and root room
5
Establish a regular, deep irrigation routine. Use a drip irrigation system or drip hose at the base of the plants to keep soil constantly moist, but avoid getting water on the plants to prevent powdery mildew.
Water base only Keep leaves dry Deep root soak Drip hose Cross-section · Target water to roots to prevent powdery mildew on foliage
6
Apply a balanced, low-nitrogen fertilizer twice during the growing season before the heads begin to form. Avoid excess nitrogen, as this causes leaves to grow too quickly.
7
Maintain the plants by removing dense leaves by hand to improve air circulation. To encourage multiple side shoots rather than one large head, pinch off the central head about 1 month after transplanting.
Central head Dense foliage Main stem pinch off Remove central head to promote side shoot growth
8
Harvest the main head 50 to 100 days after planting when the buds are deep-green, firm, and tightly packed. Cut the head 4 to 5 inches below the head swiftly with sharp tools. Harvest in the early morning for maximum flavor.
tightly packed head 4-5" below head sharp tool Cut swiftly Harvest by cutting the stem several inches below the crown to allow side shoots to grow.

Pro Tips

  • To prevent aphid infestations, rotate the planting area each year and avoid planting where other cole crops (cabbage, kale, kohlrabi) have been for at least 5 years.
  • If broccoli begins to flower or turn yellow due to warm weather, harvest it immediately to avoid a bitter taste.

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