How to Sow and Grow Brussels Sprouts: A Complete Guide
Brussels sprouts need a long season, firm soil and patience. Plants are normally started in spring and harvested from autumn through winter. Loose soil, poor light or late sowing can produce tall plants with small or open buttons.
Choosing varieties
Early varieties begin in autumn, while midseason and late cultivars extend harvest through winter. Modern hybrids often produce uniform tight sprouts; open-pollinated varieties provide broader harvest windows. Choose shorter sturdy plants for exposed sites and clubroot-resistant cultivars where appropriate.
When and how to sow
Sow from early to mid-spring, 1–2 cm deep in modules or a seedbed. Keep around 15–20°C for germination and grow seedlings in bright, cool conditions. Thin promptly and do not let plants become root-bound before transplanting.
Preparing the bed
Choose full sun and fertile, moisture-retentive soil. Add mature compost well ahead of planting, then allow soil to settle. Brassicas require firm ground. Test before liming; excessive or poorly timed lime can create nutrient problems.
Planting and spacing
Harden plants for 7–10 days. Plant deeply up to the lowest leaves and firm strongly with your heel or hands. Space 60–75 cm apart, with similar room between rows. Insert stakes at planting in windy gardens to avoid later root damage.
Watering and feeding
Water after planting and during prolonged drought. Mulch to conserve moisture. A balanced organic fertiliser suits poor ground, but heavy nitrogen encourages loose sprouts and top-heavy plants. Remove weeds shallowly.
Supporting and maintaining plants
Tie stems loosely to stakes. Remove only yellow or diseased lower leaves; stripping healthy leaves early reduces the plant’s ability to fill sprouts. Topping plants may make buttons mature together but is best reserved for late uniform harvesting.
Common problems
Blown sprouts: firm the soil, avoid excess nitrogen and choose reliable varieties
Cabbage caterpillars: use insect-proof mesh and inspect leaves
Clubroot: rotate brassicas and improve drainage
Pigeons: protect plants with strong netting
Aphids: check growing tips and wash off small colonies
Harvesting and storing
Pick sprouts from the bottom of the stem upward once they are firm and about walnut sized. Snap or cut them cleanly. The leafy top can be harvested at the end and cooked like cabbage. Sprouts are best freshly picked but can be refrigerated or blanched and frozen.
A reliable approach
Sow early enough, plant deeply into settled firm soil, stake before wind becomes a problem and harvest from the bottom upward. Avoid lush feeding that weakens stems and opens the buttons.
