What to Plant in August: European Vegetable Garden Guide
What to plant in August across Europe: the autumn and winter crops to sow now, the garlic and onion harvest, and the tasks that carry your garden into the cooler months.
August is the pivot of the growing year. The summer garden is still pouring out tomatoes, beans, and courgettes, but the smart planting has already turned toward the cold months. Knowing what to plant in August is mostly about the autumn and winter harvest – the hardy greens, salads, and roots you sow now and pull from October right through to spring. It is also harvest month for garlic and onions, and the moment to start setting the garden up for next year.
This guide covers what still goes in the ground in August across European climate zones, the crops that will feed you through winter, and the key tasks – from curing alliums to sowing green manure – that decide how well your beds carry into autumn.
A Quick Climate Check for August
Climate shapes August more than almost any other month, because it splits Europe into two opposite jobs. Atlantic Cfb gardens (UK, Ireland, Netherlands, northern France) stay mild and moist – this is a strong autumn and winter sowing window, ideal for spinach, chard, oriental greens, spring cabbage, turnips, winter radish, and prep for overwintering onions. Continental Dfb zones (Germany, Czechia, Poland, Slovakia, eastern France) are the main autumn-sowing month and the peak of the garlic and onion harvest, with soil still warm enough for fast germination. Mediterranean Csa zones (southern Spain, southern Italy, southern France) treat August as the "restart" month: as the fierce heat eases in late August, a big autumn vegetable-sowing window finally opens after the mid-summer pause.
If you are not sure where your garden sits, our European climate zones guide explains how to find your zone and what it means for sowing windows.
What Still Goes in the Ground in August
August sowing is almost entirely about autumn and winter crops. Sow into moist soil, keep the surface damp until germination, and give heat-sensitive seeds a shaded spot until they are up.
| Crop | Sow / plant | Zone notes |
|---|---|---|
| Spinach | Direct sow | The classic August sowing for autumn and overwintering leaves. |
| Winter lettuce | Module or direct | Hardy varieties for late-autumn and cold-frame heads. |
| Lamb's lettuce (corn salad) | Direct sow | Sow now for winter picking; very cold-hardy. |
| Swiss chard | Direct sow | Reliable for autumn and mild-winter harvests. |
| Oriental greens (pak choi, mizuna) | Direct sow | Much less prone to bolting now the longest days have passed. |
| Turnips | Direct sow | Quick autumn crop from an early-August sowing. |
| Winter radish and mooli | Direct sow | Larger storage radishes to lift before hard frost. |
| Spring cabbage | Module | Sow now, transplant in autumn for a spring harvest. |
| Rocket and mustard | Direct sow | Fast, peppery leaves for autumn salads. |
| Overwintering onions | Prep for late sow | Csa/Cfb: prepare beds for late-August/September sets. |
The Autumn and Winter Garden Takes Centre Stage
This is the main planting event of August. The beds that carry you through the cold are sown and planted now, while the summer crops are still producing.
- Sow hardy salads for winter. Lamb's lettuce, winter purslane, land cress, and hardy lettuce sown now stand through the cold in a cold frame, polytunnel, or sheltered bed.
- Get spinach and chard in early. An early-August sowing gives autumn leaves and, in milder zones, plants that overwinter for an early-spring cut.
- Sow oriental greens and rocket. With the longest days behind, pak choi, mizuna, and rocket bolt far less than they did in July – August is their easiest sowing window.
- Transplant autumn brassicas. Any spring cabbage or late kale started in modules moves to its final bed now; net against cabbage white butterflies from day one.
- Plant strawberry runners. Late August is prime time to set out rooted runners, so plants establish before winter and fruit well next summer.
Sow winter salads in the coolest, dampest spot
Lamb's lettuce, spinach, and winter lettuce germinate poorly in dry August soil. Water the drill before sowing, sow shallow, and keep the surface shaded and damp until the seedlings are up – patchy autumn rows almost always trace back to a dry sowing.
Harvest, Cure, and Preserve
August is as much about bringing crops in as putting them out, and how you harvest now decides how long they store.
- Lift garlic and onions. When garlic leaves yellow and onion tops flop and brown, lift on a dry day, then cure in a warm, airy, dry place for two to three weeks before storing. Our harvest timing guide covers the signs to look for.
- Keep picking tomatoes, beans, and courgettes daily. Frequent harvesting keeps plants productive right through the month – a single missed courgette turns to a marrow and slows the plant.
- Preserve the glut. August is peak preserving month: freeze beans, make passata from surplus tomatoes, and store cured onions and garlic in a cool, dark, dry place.
Key August Garden Tasks
Beyond sowing and harvesting, a handful of jobs set the garden up for autumn and next year.
- Keep watering and mulching. Heat and dry spells run well into August. Water deeply at the base 2–3 times a week rather than daily sprinkles, and keep a 5–7 cm mulch on bare soil to hold moisture. See how to mulch your garden and our watering guide.
- Sow green manure on cleared beds. As summer crops finish, sow phacelia, mustard, or field beans to protect and feed the soil over winter instead of leaving it bare.
- Keep succession sowings rolling. Small, frequent sowings of rocket, radish, and salad leaves fill the gaps left by finished crops – our succession planting guide explains the rhythm.
- Order and prepare for autumn planting. Get overwintering onion sets, garlic, and spring-cabbage plants lined up now for September.
Common August Mistakes
- Skipping the autumn sowings. August is the last easy window for spinach, winter salads, and oriental greens. Miss it and the winter garden is bare.
- Sowing into dry soil. August soil dries fast. Water the drill first and shade the surface, or germination will be patchy.
- Storing garlic and onions before curing. Skipping the two-to-three-week cure means alliums rot in storage instead of lasting through winter.
- Leaving cleared beds bare. Empty August soil bakes, erodes, and loses nutrients – sow green manure or mulch instead.
- Letting the watering slip too early. Autumn feels close, but August heat still stresses shallow-rooted seedlings; keep watering deeply until the rains return.
Plan Your August Garden With Plantory
August asks you to harvest and preserve the summer garden while sowing the autumn and winter beds that most people forget. With Plantory, you can lay out your winter salad, spinach, and brassica sowings, set reminders for each succession sowing and for curing your garlic and onions, track your watering through late-summer heat, and keep your harvest log and bed map in one place so the pivot month of the year sets you up for a productive autumn instead of a bare one.