Summer is the garden's peak season: long days, warm soil, and fast growth. It is also the season that tests a gardener most, with heat, drought, pests, and weeds all at their strongest. A summer garden that is watered well, mulched deeply, and harvested regularly will produce abundantly for months. A summer garden that is left to dry out, bolt, and go to seed will stall by midsummer. This guide covers watering in heat, mulching, managing sun and pests, succession sowing, and harvesting warm-season crops, so the garden keeps producing from the first warm days to the first cool nights of fall.
The rhythm of summer is different from spring. In spring, the work is sowing and planting. In summer, the work is maintenance: watering, feeding, weeding, and harvesting, with a little sowing in between for the crops that follow. The garden grows fast in summer, and problems grow fast too, so a short daily check — a walk through the beds, a look at the soil, a hand on a leaf — catches most issues while they are still small.
Watering in the heat
Water is the central job of summer. Warm-season crops drink heavily, and the soil dries fast in sun and wind. Water deeply and less often, rather than lightly and daily: deep watering encourages roots to grow down, while shallow watering keeps roots at the surface where they dry out fastest. Water in the morning if you can, so the leaves dry during the day and the soil is moist before the heat arrives. Avoid watering in the heat of the day, when much of it evaporates, and avoid wetting the leaves late in the evening, when damp leaves overnight encourage disease.
Mulch is what makes watering work. A mulch layer shades the soil, cuts evaporation, and keeps the root zone cool and damp — see our mulch gardening and summer mulching guide guides. Water the soil, not the leaves, and water at the base of the plant where the roots are. Drip irrigation or a soaker hose delivers water slowly to the root zone with minimal waste, and it keeps the leaves dry. Our watering calculator can help you plan watering, and our ollas watering and wicking beds guides cover water-efficient methods that suit hot weather. If you are unsure about watering or water restrictions in your area, check your local extension service.
Warm-season crops and succession sowing
Summer belongs to warm-season crops: tomatoes, peppers, cucumbers, zucchini, beans, corn, squash, and eggplant fruit heavily in the heat. See our growing tomatoes, growing cucumbers, growing zucchini, and growing eggplant guides for what those crops need. Feed hungry crops regularly with compost or a liquid feed, support tall plants before they fall over, and harvest little and often — regular picking encourages beans, zucchini, and cucumbers to keep producing, while leaving fruit to overmature slows the plant down.
Succession sowing keeps the harvest coming: sow lettuce, beans, zucchini, and carrots every few weeks, so that as one sowing finishes, the next is ready. See our succession planting guide. And in midsummer, while the garden looks its fullest, sow the fall garden — lettuce, spinach, kale, and carrots for fall and winter — because fall crops need to be well grown before the cold arrives. Our fall gardening guide covers that transition.
Sun, heat, and shade
Most vegetables love sun, but extreme heat stresses them. Lettuce and spinach bolt — run to seed — in hot weather, so sow them in partial shade in summer, or grow them under a taller crop that shades them. Tomatoes and peppers can suffer sunscald on their fruit in very hot sun, and blossoms can drop when temperatures stay high. Shade cloth over the most vulnerable crops, or planting them where they get afternoon shade, helps in the hottest climates. Keep the soil cool with mulch, and water consistently, since uneven watering causes problems such as blossom end rot in tomatoes and splitting in carrots and radishes.
In very hot climates, the summer garden needs a different rhythm: sow cool-season crops in the milder months and use summer for the heat-lovers that thrive in it. In frost-free zones 11–13, summer is hot and humid, and the challenge is heat and disease rather than cold — choose heat-tolerant varieties, give plants good air circulation, and water at the base to keep leaves dry.
Pests, diseases, and weeds in summer
Summer is peak season for pests and diseases. Aphids, caterpillars, squash bugs, and cucumber beetles all appear in force, and fungal diseases spread fast in warm, damp weather. Check plants regularly, pick off pests by hand where you can, and encourage beneficial insects by growing flowers nearby. Remove diseased leaves promptly and do not compost diseased material — see our aphids control, caterpillars on plants, and powdery mildew treatment guides for specific problems. Keep the garden tidy, give plants space for air to circulate, and avoid wetting the leaves when you water.
Weeds grow as fast as crops in summer, so weed little and often, and keep the mulch topped up — a thick mulch layer is the best weed control there is. A few minutes of weeding every few days beats a large weeding session once a month, and it keeps weeds from setting seed.
Harvesting and preserving the summer glut
Summer produces a glut, and the glut needs a plan. Harvest in the cool of the morning, when vegetables are crisp and full of water, and use the best of each picking fresh. Preserve the surplus: freeze beans, peas, and corn — see our freezing vegetables guide — store roots and squash — see our harvest storage guide — and can what suits canning, remembering that canning must follow a tested recipe exactly and that low-acid vegetables need pressure canning — see our canning vegetables guide. Share the surplus with neighbours, since a glut shared is a glut enjoyed, and it builds the kind of local exchange that makes gardening richer.
Common mistakes
The most common mistake is watering lightly and daily, so roots stay shallow and plants wilt in the first hot spell. The second is letting the mulch thin out, so the soil dries and weeds take over. The third is forgetting to sow the fall garden in midsummer, so there is nothing to harvest in fall. The fourth is leaving fruit to overmature on the plant, which slows production. The fifth is ignoring pests and disease until they are established, when early action would have controlled them. Water deeply, mulch thickly, sow successions, harvest often, and check the plants daily.
Frequently asked questions
How often should I water in summer?
Water deeply and less often rather than lightly and daily, and water in the morning. How often depends on your soil, your weather, and your crops — check the soil with a finger a few centimetres down, and water when it is dry at that depth.
Why are my tomatoes dropping blossoms in summer?
Blossom drop is often caused by very high temperatures, or by uneven watering. Keep the soil evenly moist with mulch and regular deep watering, and give plants afternoon shade in the hottest climates if you can.
Should I feed vegetables in summer?
Yes — warm-season crops are hungry, and regular feeding with compost or a liquid feed keeps them fruiting. Feed little and often rather than heavily and rarely, and water before feeding so the feed reaches the roots.
What should I sow in midsummer?
Sow succession crops for continued summer harvests — lettuce, beans, zucchini, and carrots — and sow the fall garden: lettuce, spinach, kale, and carrots for fall and winter. Check your zone pages in our planting calendar for what to sow each month.
How do I keep lettuce from bolting in summer?
Grow lettuce in partial shade, sow heat-tolerant varieties, keep the soil cool and moist with mulch, and harvest leaves young. In the hottest weather, lettuce is best sown again in late summer for fall. If you are unsure about varieties for your area, check your local extension service.