Brussels Sprouts
Brassica oleracea var. gemmifera
Brussels sprouts form small heads along a tall stem over a long cool season. Transplants started indoors 6–8 weeks before the last frost give the crop time to size up before autumn, and light frost near harvest often improves flavor compared with sprouts rushed in warm weather. Harvest timing is counted from transplanting rather than indoor seeding.
Plant family Brassicaceae · Also called brussels sprout
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Start indoors for a long cool season.
Start seed indoors 6–8 weeks before the last spring frost at about 0.6 cm depth. Germination is typically 5–10 days. Set transplants outdoors from four weeks before the frost through the frost date.
Hardy frost tolerance allows cool-season establishment, but young transplants still need hardening. The long season means spring planting targets autumn harvest rather than summer picking.
Use this range as a planning baseline and adjust for local conditions.
Use this range as a planning baseline and adjust for local conditions.
Use this range as a planning baseline and adjust for local conditions.
Use this range as a planning baseline and adjust for local conditions.
Allow tall plants and wide spacing.
Allow 45–60 cm between plants and 90 cm between rows. Upright stems become top-heavy as sprouts fill, so wide spacing supports airflow and access along the stalk.
Containers need at least 40 cm depth and about 30 litres per plant. Standard space need reflects height and the duration the plant occupies the bed.
Core measurements
Crop-level planning range.
Crop-level planning range.
Crop-level planning range.
Crop-level planning range.
Allow for the mature form of the selected variety.
Install support early when it is required or useful.
Keep moisture high while sprouts form.
Six hours of direct sun is the minimum. Sprouts develop along the stem over many weeks, so steady light supports uniform sizing from bottom to top.
High water need with 35–50 mm weekly and pH 6.5–7.5 suits this brassica. Even moisture during head formation reduces stress that can produce loose or poorly filled sprouts.
Sunlight
Full sun (6+ direct-sun hours/day)
Soil pH
A suitable acidity range for general growth.
Weekly water
High water need.
Keep soil consistently moist but not waterlogged, especially during establishment and harvest development.
Use frost timing, not speed alone.
The 90–120 day range begins at transplanting, not indoor seeding. Lower sprouts mature first; twist or cut them as they reach usable size while upper ones continue to develop.
Light frost before harvest is often beneficial for flavor. Plants left too long may open or yellow; use the range as planning guidance tied to your transplant date.
Read with the full crop profile.
Read with the full crop profile.
Read with the full crop profile.
Read with the full crop profile.
Plan for a long cool season; light frost often improves sprout flavor.
Brussels Sprouts growing questions
Why are Brussels sprouts transplanted rather than direct-sown?
Transplanting gains weeks of controlled indoor growth before the long outdoor season. Harvest days are counted from transplanting.
Does frost ruin Brussels sprouts?
Hardy classification and the key tip note that light frost often improves sprout flavor rather than destroying the crop.
How tall do Brussels sprout plants grow?
Growth is upright with sprouts along the stem. Wide row spacing partly accommodates height and the need to harvest along the stalk.
What indoor lead time is needed?
Start seed indoors 6–8 weeks before the last spring frost, then transplant during the outdoor window around that frost date.
Profile values are crop-level planning ranges compiled from sources S1,S2,S3,S4. Local climate and variety can change actual results.
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