When to plant Sprouting Broccoli in Cardiff

Sow seeds in modules around 8th March - 23rd March, about 1 cm deep. Keep them in bright, cool conditions and thin to one seedling per module once they have a couple of true leaves.

From 22nd March, keep the young plants moving steadily in good light and water them lightly but regularly. Avoid letting them become pot-bound, as checked growth can lead to weaker plants later.

Harden off seedlings over 30 days from 5th April to 4th May. Give them a few days outside in shelter, then leave them out for longer each day before planting.

Plant out from 6th May, setting each plant 60 cm apart in rows spaced wider than that. Firm the soil well around the roots, then water in thoroughly so the plants settle and the roots do not rock in the wind.

From 29th April, cover the crop with fine mesh to keep out cabbage white butterflies and pigeons. Fit brassica collars round the stems at planting time or soon after to reduce cabbage root fly damage.

Start feeding from 27th May and repeat every 28 days until 14th October. Use a high-nitrogen feed while the plants are making leaves, then stop before the coldest weather so the growth stays firm rather than soft.

Cut the first side shoots from 2nd January 2028 and keep picking until 13th March 2028. Harvest the shoots while they are tight and tender, cutting just above a leaf joint so more side shoots can follow.