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Vegetable growing really takes off this month. Chit and plant out second early potatoes in the first half of the month and maincrop potatoes in the second half. It’s also time to sow seed outdoors in well-prepared soil.

Sowing and planting

Fruit

• Ideal time to plant pot-grown fruit trees and bushes.

Vegetables

• Chit and plant out second early potatoes in the first half of the month, maincrop potatoes in the second half.

• Sow seed outdoors for beetroot, carrots, Swiss chard, summer cauliflower, kohl rabi, lettuce, leeks, radish, turnip, spring and pickling onions, peas and perpetual spinach in well-prepared soil.

• Try sowing unusual vegetables such as salsify, Hamburg parsley, or scorzonera.

• Sow seed indoors of marrows, courgettes, pumpkins and squash. Also sweet peppers, tomatoes, cucumbers, aubergines, celery, celeriac, salads and globe artichokes.

• In very mild areas sow dwarf French beans and sweet corn outside under cloches or plastic-free or re-used fleece at the end of April. In cooler areas wait until May.

• Sow a seedbed of brassicas to provide transplants of sprouting broccoli, cauliflowers and cabbages for planting out in June or July.

• Transplant broad beans grown in pots.

• Plant onions, shallots and garlic sets.

• Plant Jerusalem artichoke tubers.

• Plant asparagus crowns.

• Pot up tomato seedlings when they develop true leaves above the more rounded seed leaves.

Prevention

• Tolerate aphids, apple sucker, pear sucker, pear midge, caterpillars and powdery mildew.

• Look out for red spider mite and aphids on strawberries under glass and use biological controls if needed.

• Keep on top of weeds around seedlings by hoeing or digging out, and continue through to summer.

General care

Fruit

• Liquid feed fruit trees in pots with a balanced feed every fortnight.

• Where possible, protect plum and pear flowers from frost but allow insects access for pollination.

• Damp down or mist citrus plants regularly when flowering begins. Maintain a mininum temperature of 14°C (57°F).

• Remove blossom from strawberries planted since September to help with establishment.

• Pick forced strawberries under glass.

• Ventilate strawberries under cloches and mulch with straw or mats.

Vegetables

• Support pea plants with sticks, twigs or wire netting.

• Thin out rows of seedlings as soon as they are large enough to be handled.

• Protect early outdoor sowings with cloches or plastic-free or re-used fleece.

• Dig up selected chicory roots, pot them up, and position them in a dark warm place (10-13°C; 50-55°F), with an upturned pot over them to force.

• Prepare runner bean supports for sowing (in May) or planting out (in June).