Broccoli

Brassica oleracea var. italica

vegetableBrassicaceaeEetbaar

Broccoli (Brassica oleracea var. italica) is a edible vegetable from the Brassicaceae family that grows up to 70cm tall. This plant thrives in full sun and requires moderate maintenance. Attracts butterflies.

Hoogte

40–70 cm

Breedte

40–60 cm

Zonligging

full sun

Waterbehoefte

moderate

Grondsoort

loam, clay soil

Onderhoud

moderate maintenance

Ecologische waarde

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Verzorgingskalender

Taak	Jan	Feb	Mrt	Apr	Mei	Jun	Jul	Aug	Sep	Okt	Nov	Dec
🌱Planten
💧Bemesten
🍎Oogsten

Care tips

Planting

Broccoli thrives in full sun and prefers fertile, moisture-retentive loam or clay soil with a pH between 6.0 and 7.0. Before planting, dig in plenty of well-rotted manure or garden compost to improve soil structure and nutrient levels—brassicas are hungry feeders. The soil should be firm, so tread it down gently after digging; loose soil encourages weak stems and poor root development. In temperate Europe, sow broccoli seeds indoors in modules or small pots from March onwards, or outdoors in a seedbed from April. Transplant seedlings when they have four to six true leaves, typically in April or May, spacing them 45 cm apart in rows 60 cm apart. This generous spacing allows good air circulation, which helps prevent fungal diseases common in brassicas. Plant firmly so the lowest leaves are just above soil level; broccoli needs a stable anchor as it grows top-heavy. Water transplants in thoroughly to settle roots and eliminate air pockets. If your soil is light or sandy, work in extra organic matter beforehand to help retain moisture, as broccoli dislikes drying out. On exposed sites, consider using brassica collars around the base of each plant to deter cabbage root fly, and cover young plants with fine mesh or fleece to protect against cabbage white butterflies and pigeons, which can strip foliage quickly. Mulch around plants once established to conserve moisture and suppress weeds, but keep mulch a few centimetres clear of the stem to reduce the risk of rot.

Pruning

Broccoli doesn't require pruning in the traditional sense, but it does benefit from careful harvesting and removal of spent material to maximise your crop. The main head forms at the top of the central stem and should be cut when the florets are tight and dark green, before any yellow flowers appear. Use a sharp knife to cut the head with about 15 cm of stem attached, making the cut at a slant to shed water and reduce the risk of rot. After harvesting the main head—typically from July onwards—don't pull up the plant. Leave the stem and leaves in place, and side shoots will develop in the leaf axils over the following weeks. These secondary spears are smaller but perfectly edible and can extend your harvest well into autumn. Keep picking these side shoots regularly, every few days if necessary, to encourage more production; once they start to flower, the plant's energy shifts away from producing new shoots. Remove any yellowing or damaged lower leaves as the season progresses to improve air flow around the base and reduce hiding places for pests like slugs and aphids. At the end of the season, once the plant stops producing or after the first hard frosts, pull up the entire plant, roots and all. Do not compost brassica roots if your garden has had clubroot problems; bin them instead. Chop up healthy stems and leaves and add them to the compost heap, or dig them back into the soil as green manure to return nutrients.

Maintenance

Broccoli has moderate water needs but performs best with consistent moisture, especially during head formation. Water deeply once or twice a week during dry spells, aiming for the base of the plant rather than overhead to minimise fungal issues. In hot summer weather, increase watering frequency; wilting or drought stress can cause premature bolting or small, bitter heads. Feed broccoli in May and June with a balanced general-purpose fertiliser or a nitrogen-rich feed to support leafy growth and head development. A liquid seaweed feed every two to three weeks is also beneficial. Avoid overfeeding with nitrogen late in the season, as this encourages soft growth vulnerable to frost and pests. Broccoli is hardy and tolerates light frosts, which can actually improve flavour. In autumn, plants will continue cropping into October or even November in mild areas. No special overwintering protection is needed for summer-planted varieties, though fleece can extend the harvest if temperatures drop sharply. Common pests include cabbage white caterpillars, which can defoliate plants rapidly—inspect undersides of leaves regularly and pick off eggs and caterpillars by hand, or keep plants netted. Aphids cluster on young shoots and under leaves; wash off with a strong jet of water or use an insecticidal soap. Pigeons are persistent; netting is the only reliable deterrent. Clubroot is a serious soilborne disease causing stunted, wilted plants; practice crop rotation, moving brassicas to a different bed each year, and lime acidic soils to raise pH above 7 if clubroot is present.