How To Grow Brussels Sprouts / RHS Gardening

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Brussels sprouts become top-heavy, so you may need to provide extra support

Brussels sprouts are in the ground for a long time, so check plants regularly for any signs of problems. Water if the soil starts to dry out and remove fading leaves to improve airflow around the plants, which helps to deter fungal diseases. Keep cabbage butterflies and pigeons at bay with fine-mesh netting.

Watering

Water young plants regularly, never letting the soil dry out. Once they’re well established and growing strongly, they should only need watering during dry weather or on very free-draining soil. See our water-saving tips below.

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Mulching

Apply a thick layer of mulch , such as well-rotted manure or garden compost, around the plants to help hold moisture in the soil and reduce the need for watering. Mulch will also deter weed germination .

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Feeding

On poor soil, or to boost slow growth, you can apply a nitrogen-rich fertiliser in June or July.

Weeding

Keep young plants weed-free, to reduce competition for light, water and nutrients. Dense weeds can also provide shelter for slugs and snails. See our tips on controlling weeds.

Supporting plants

In late summer, mound up soil around the base of the stems, to provide extra support before autumn gales arrive. Taller plants may also need staking with a sturdy bamboo cane , especially in exposed sites. This will prevent wind buffeting these top-heavy plants, which can loosen the roots and hinder growth or even blow them over.

Protecting the crop

Brussels sprouts are vulnerable to the typical brassica problems, including pigeons and various insects, so keep plants protected at all times. The easiest option is to cover the crop with insect-proof mesh, supported on canes and pinned into the ground. See Problems, below, for more tips.

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