Summer is when the vegetable garden earns its keep, and it is also when it asks the most of the gardener. Plants that were small seedlings in spring are now large, thirsty and heavy with fruit, and they need water, food, support and regular picking to keep producing. A tomato plant left unwatered in a heatwave will split its fruit, a bean plant left unpicked will stop producing, and a squash plant left to sprawl will take over the bed. The summer vegetable routine is therefore a daily one in miniature — a morning walk, a watering can, a basket for picking — and this guide covers it crop by crop. For local advice, check your local extension service.
Watering vegetables in the heat
Vegetables need consistent moisture in summer, and the crops that show irregular watering most clearly are the fruiting ones. Tomatoes split or develop blossom end rot when watering is erratic, cucumbers turn bitter when they dry out, and lettuce bolts when it is stressed by drought. Water deeply at the base, two or three times a week rather than lightly every day, and mulch heavily to even out the moisture. Water in the morning, so the soil is moist before the heat builds and the foliage dries quickly, and avoid wetting the leaves, which invites disease.
Leafy crops — lettuce, spinach, chard and herbs — need the most frequent watering, because their leaves lose water fast and they have shallow roots. Root crops need less frequent watering once they are established, but they still need steady moisture to grow evenly, and a carrot that dries out and then is watered heavily will split. The watering calculator and the watering schedule generator can help you plan, and our summer watering guide covers the principles in detail.
Feeding fruiting vegetables
Fruiting vegetables — tomatoes, peppers, eggplant, cucumbers, squash and sweet corn — are the heaviest feeders in the summer garden, and they benefit from a regular liquid feed once they are flowering and fruiting. Use a feed high in potash, such as a tomato feed, every one to two weeks at the label strength or weaker, applied to moist soil in the evening or early morning. Compost mulch around the base feeds the soil slowly and holds moisture, and it is the best base for any feeding programme.
Leafy crops need nitrogen to keep producing leaves, but too much nitrogen makes them soft and prone to pests, so feed them lightly. Root crops need very little feeding — too much nitrogen makes them grow leaves at the expense of roots. Do not feed a plant that is stressed by drought; water it first, let it recover, and feed it only when it is growing again. Our summer fertilizing guide covers feeding in detail, and the fertiliser calculator can help with quantities.
Supporting, training and pruning
Support tomatoes before they need it, with a stake, a cage or a string, and tie the stem loosely as it grows. Remove the side shoots that grow in the leaf joints of cordon varieties, little and often, so the plant puts its energy into fruit rather than foliage, and remove the lower leaves that touch the soil, which are the first to pick up disease. Cucumbers, squash and melons can be trained up a trellis or a fence, which saves space, keeps the fruit clean, and improves air flow — and their growing tips can be pinched out once they have set fruit, to stop the plant sprawling endlessly.
Beans need a cane, a pole or a net to climb, and they should be given their support at sowing time, so the young plants can find it as soon as they emerge. Peas need netting or twiggy sticks, and sweet corn needs no support but does need to be planted in a block rather than a single row, so the wind can pollinate it. Check supports after wind or heavy rain, and re-tie any stems that have slipped. For crop detail, see growing tomatoes, growing cucumbers and growing green beans.
Pests and diseases in the summer vegetable garden
Aphids cluster on the soft tips of beans, peppers and brassicas in summer, and a strong jet of water will dislodge most of them, while ladybirds and other predators will eat the rest. Caterpillars strip brassicas quickly, and the best defence is a fine mesh cover from planting, plus a weekly check of the undersides of leaves. Slugs and snails feed at night on lettuce, seedlings and strawberries, and the most reliable control is to go out after dark and remove them by hand, keeping beds clear of debris where they hide.
Blight on tomatoes and potatoes spreads in warm, wet weather, and the first sign — dark spots on lower leaves — should prompt you to remove affected leaves and improve air circulation immediately. Powdery mildew appears as a white coating on squash and cucumber leaves in warm, dry weather; improve air flow, avoid overhead watering, and remove the worst-affected leaves. Do not compost diseased material — put it in the green waste bin. The pest identifier helper can help you identify what you are seeing, and our summer pest control guide covers the main pests in detail.
Harvesting little and often
Pick vegetables little and often, in the morning, when they are crisp and at their best flavour. Beans picked every two or three days stay tender and keep the plant producing; beans left too long become tough and the plant slows down. Courgettes picked small keep the plant producing all summer, while one left unpicked will put all its energy into a few huge fruits. Tomatoes picked when fully coloured and slightly soft taste best, and lettuce picked leaf by leaf from the outside keeps producing for weeks.
Succession-sow quick crops every two or three weeks — lettuce, radishes, beans, carrots and beets — so the harvest keeps coming instead of arriving all at once, and clear a bed promptly when a crop finishes, sowing or planting the next one the same day. From midsummer onwards, sow the fall garden — brassicas, kale, chard, peas and carrots — so the harvest continues into autumn. Our summer harvesting guide and summer planting guide cover picking and sowing in detail.
A summer vegetable checklist
Walk the garden every morning: water at the base, pick what is ready, pinch out tomato side shoots, and check for pests on the undersides of leaves. Feed fruiting vegetables every one to two weeks, mulch heavily, and succession-sow quick crops so the harvest keeps coming. Support plants before they flop, remove diseased leaves promptly, and note what worked and what did not, so next year's plan is better.
Summer vegetable care is a routine, not a set of occasional jobs, and the gardeners with the best harvests are usually the ones who do a little every day rather than a lot once a week. A morning walk, a watering can and a basket are the tools that matter most. For the rest of the summer routine, read our summer harvesting guide and browse the guides hub and the planting calendar for the full seasonal series.
Frequently asked questions
How often should I water vegetables in summer?
Deeply at the base, two or three times a week rather than lightly every day, and mulch heavily to even out moisture. Leafy crops need the most frequent watering, and tomatoes and cucumbers suffer most from irregular watering — they split, turn bitter or develop blossom end rot.
Should I prune tomato plants in summer?
Yes, for cordon varieties: pinch out side shoots in the leaf joints little and often, and remove lower leaves that touch the soil. Do it when shoots are small, and never strip a plant bare in one session.
Why are my courgettes huge and my plant not producing more?
A courgette left unpicked puts all its energy into a few huge fruits and stops producing. Pick courgettes small, when they are fifteen to twenty centimetres long, and pick regularly — a plant picked often will keep producing all summer.
What pests attack vegetables in summer?
Aphids on beans and peppers, caterpillars on brassicas, slugs on lettuce and strawberries, and flea beetles on young brassicas. Check the undersides of leaves weekly, use mesh covers on brassicas, and remove pests by hand where you can.
When should I sow for fall vegetables?
From midsummer onwards, so the crops mature in autumn. Sow brassicas, kale, chard, peas, carrots and beets, and check your local extension service for fall sowing dates in your area.