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Brassica oleracea var. gemmifera

Brussels Sprouts

Brussels Sprouts growing guidance with clear planting, care and harvest expectations.

Grows in Zones 4–12Growing guide
Brussels Sprouts growing or ready to harvestPhoto: Emmanuel.revah · CC BY-SA 4.0

Set your expectations

How long until you can harvest?

45–100 days from seed
Cold-weather noteEstablished plants tolerate light frost; heat is usually the bigger problem.
Start withSeeds or young transplants
Life cycleUsually grown as an annual
DifficultyModerate

Your seasonal plan

When to grow brussels sprouts in Zone 6.

Planting usually begins later in spring than it does in warmer zones. These are useful planning windows, not exact weather guarantees.

Typical planting windowMarch–May and August–September
Typical harvest windowMay–August and October–December

Growing essentials

What brussels sprouts need to thrive.

Use the practical details below with your Zone 6 timeline. Current weather and the variety you choose can shift timing.

LightFull sun; light afternoon shade in warm climates
SoilFertile, moisture-retentive, well-drained soil, pH about 6.0–7.5
Planting depth¼–½ in seed; set the seedling at the same depth it grew in its container
Spacing18–24 in
WaterProvide 1–1½ inches weekly and avoid swings between dry and saturated soil.
Best conditionsCool weather with steady growth; protect young plants from hard freezes and mature crops from heat.

How to plant

Plant it well.

Start transplants or Plant seeds directly in the garden; set sturdy seedlings at the same depth they grew in their cells.

Indoors or containers

Start seedlings under lights, then gradually introduce seedlings to outdoor conditions. Full crops need outdoor light and space.

Keep it growing

Care through the season.

  • Mulch to keep roots cool and moisture even.
  • Inspect leaf undersides for caterpillars and use insect netting before pests arrive.
  • Feed lightly after establishment if growth is pale or slow.
What to avoid

Planting too late into warm weather can cause small heads or early flowering.

Ready to harvest

Know the cue, not just the date.

  • Twist off firm sprouts 1–2 inches wide from the bottom upward, often after light frost.
  • Harvest during the cool part of the day when practical. Use clean tools, then cool, store or use the harvest promptly.

How we know

Sources and growing guidance.

The growing essentials and seasonal planning windows are original summaries informed by university Extension references; always adjust for current local weather and variety instructions.

Vegetable planting and garden planningUniversity of Minnesota ExtensionFlorida Vegetable Gardening GuideUniversity of Florida IFAS Extension

Growing essentials compiled · November 2026