Early August is the bit of the gardening year that catches us out. The borders are still bursting, the courgettes are silly with fruit, and the lawn looks tired — and yet, quietly, the autumn garden is being set up now. The salad you’ll be cutting in October, the sweet williams that’ll bloom next June, the garlic that’ll come out of the ground for next summer’s roasts: all of them go in over the next two or three weekends.
This guide pulls together the jobs that actually matter in early August in a UK garden, plus the two things almost no one writes about: holiday-proofing your patch while you’re away, and getting the children involved while the schools are off. We’ve grouped the work by how much time you’ve got — 30 minutes, a Saturday morning, or a proper weekend project — so you can pick what fits.
Vegetables to sow and plant in August (UK)
This is where the rewards are biggest. A handful of seeds tucked in now turns into food on the table from October right through to next spring, when fresh greens are scarce and expensive in the shops.
Salad leaves and quick wins
Sow these direct into the ground or into a deep tray:
- Winter lettuces — ‘Winter Density’, ‘Arctic King’ and ‘Valdor’ will sit through a mild winter under a cloche.
- Rocket and oriental leaves — ‘Esmee’ rocket, mizuna and mibuna are happiest sown now; the cooler nights stop them bolting straight away.
- Lamb’s lettuce (corn salad) — slow to germinate, hardy as anything once up. Worth the wait for January salads.
- Spinach — ‘Medania’ or ‘Giant Winter’ for autumn picking; the leaves are sweeter than the spring crops.
- Radishes — four weeks from sowing to plate, which is perfect for a child’s first solo crop before the schools go back.
Overwintering crops — the planting that pays you back in May
These are the August jobs people skip and then regret in the hungry gap. Get them in by the end of the month:
- Spring cabbage — ‘Pixie’ and ‘Durham Early’ planted out as small modules in early August will heart up by April. Net them against pigeons.
- Broad beans for autumn — ‘Aquadulce Claudia’ is the classic, sown direct in late August or early September for a crop two to three weeks earlier than spring sowings.
- Japanese onion sets — ‘Senshyu’ or ‘Electric’ go in mid-to-late August and crop in early summer, neatly before the maincrop is ready.
- Autumn-planted garlic — ‘Solent Wight’ and similar hardneck varieties want a cold spell to break their cloves into bulbs, so the earlier you plant the better the harvest.
One for the kids — Christmas potatoes in a bag
This is the August project our family looks forward to most. Buy a few Christmas potato seed-tubers (specially cold-stored second-crop varieties — ‘Maris Peer’ and ‘Charlotte’ are widely sold from late July) and plant them into a 35-litre potato sack. Tip the children’s wellies on, fill the bag with compost, drop the tubers in. Keep them watered, move the bag into a shed or porch if a hard frost is forecast in November, and you’ll be tipping out Christmas-dinner new potatoes on the kitchen floor. There is no garden moment that beats it.
Flowers to sow and plant in August
Hardy annuals for an early start next year
Sown now — not in spring — these flower three or four weeks earlier and on bigger, sturdier plants:
- Cornflowers (‘Blue Boy’ is hard to beat for cottage-garden blue)
- Calendula (pot marigold — the children can sow these and they’ll come up in a week)
- Californian poppies — silky orange, drought-proof, self-sow forever after
- Larkspur for spires of blue, pink or white in May
- Nigella (‘Miss Jekyll’) for the seed-heads alone
Biennials for next summer’s borders
Sow these into a spare patch or into modules now, prick out in September, plant out in October:
- Foxgloves — ‘Sutton’s Apricot’ or the wild Digitalis purpurea
- Wallflowers for spring scent at the front door
- Sweet williams — the children love these for their freckled faces
- Honesty for the silvery seed-pods at Christmas
Autumn-flowering bulbs to plant now
These are the surprise bulbs that come up this autumn, not next spring:
- Autumn crocus (Colchicum autumnale) — pop them into a lawn or border now and they’ll be in flower by September.
- Nerine bowdenii — bright pink lilies that flower in November when nothing else does.
- Sternbergia lutea — like a yellow autumn crocus.
And while you’re thinking about it — order spring bulbs this week
The best varieties of tulip and daffodil sell out by September. Order now, plant the daffs from late August onwards (they want six weeks to get their roots down before winter), and hold the tulips back for November. If you’ve not browsed before, the Thompson & Morgan bulb range is a sensible start.
August garden jobs — by how much time you have
Borders look after themselves in August if you keep three or four small jobs ticking over. We bucket them by time, so a 30-minute window after work is enough to make a difference.
Quick wins (30 minutes)
- Deadhead roses, cosmos, dahlias and sweet peas. The plant’s job is to set seed; your job is to convince it that hasn’t worked yet so it keeps flowering until the frosts.
- Water deeply, not often — a good soak twice a week beats a daily sprinkle. Aim the can at the base of the plant, not at the leaves.
- Sweep the harvest — courgettes the size of your forearm have stopped being a vegetable and started being a marrow. Pick at 15-18 cm.
- Top up the bird bath. August dries everything out; garden birds are extra grateful.
A Saturday morning (2-3 hours)
- Give lavender its summer haircut — trim back the flowered stems to just above the new green shoots. Don’t cut into old wood.
- Light prune wisteria sideshoots back to five or six leaves to encourage flowering wood for next year.
- Reseed bare lawn patches — rake the surface, scatter grass seed, water in. Late August into early September is the sweet spot before autumn arrives.
- Turn the compost heap. Heat builds when air gets in. If you’ve never started one, our guide to starting a compost heap this spring still works perfectly well in August.
A full weekend project
- Take semi-ripe cuttings of pelargonium, lavender, hebe, rosemary and sage. Cut a 10-cm length below a node, strip the lower leaves, dip in hormone powder, push into gritty compost in a covered tray.
- Plant out the spring cabbages and brassicas properly — firm them in hard with the heel of your boot. Wobbly cabbages don’t heart up. Net them straight away.
- Save seed from anything that’s gone over — sweet peas, calendula, poppies, nasturtiums. Brown paper envelopes in a dry shed.
Holiday-proofing your garden while you’re away
The August problem nobody else writes about: two weeks abroad in the school holidays and a garden left to its own devices. Here is what twenty years of family Augusts have taught us:
- Harvest everything the morning before you go. Courgettes, beans, tomatoes the size of a plum or larger, lettuces about to bolt. What you don’t pick now will either rot or go to seed.
- Mulch the borders and the pots. A 5-cm layer of compost or grass clippings locks moisture into the soil and shades the roots. It’s the single highest-impact 20-minute job before a holiday.
- Group containers together in the shade. One pot in full sun dries out in a day; a cluster of pots in dappled shade can go four or five days without watering.
- Rig drip-bottles for the most thirsty plants. A 2-litre bottle with three pinholes in the cap, upside-down in the pot, gives a slow week-long drip. Tomatoes and runner beans especially appreciate it.
- Do the neighbour swap. Offer them your courgettes (they will have too many of their own, but be polite) in exchange for one or two waterings on the hottest days. A spare back-door key beats a fully automatic irrigation system that no one has ever installed properly first time.
- Mow the lawn the day before — but raise the blade. A long mow leaves the grass tall enough to shade its own roots while you’re gone.
- Tomatoes: remove all the side-shoots, take out the lowest leaves, pinch out the growing tip if the plant is already at the top of its support. Less foliage equals less water lost.
- Expect to come home to a few losses. A bolted lettuce or a baked basil is the cost of doing business with a UK August. Replant the empty spots when you’re back.
Gardening with the kids in the August holidays
Six weeks off school, two weeks of which it will rain. Here are the projects that have worked for us — concrete, time-bound, with something to show for it before the children lose interest:
- Radish race. Two pots, two children, two different varieties — first one to a salad-sized root. Three to four weeks, start to finish.
- Sunflower height check. Marker pen, garden cane, weekly height entries on the kitchen wall. The current record in our garden is 2.4 m; we’d love to see one of yours go further.
- Harvest hunt. Hide a colander somewhere in the veg patch and challenge the child to fill it. Bonus points for the smallest tomato, the longest bean, the most courgettes.
- Seed-saving as a rainy-day craft. Brown paper envelopes, a marker pen, the kitchen table. Calendula, sweet pea, nigella, sunflower — all easy. We’ve also got a longer kids’ gardening guide for May half-term, our June and July kids’ gardening guides that works year-round.
- The Christmas potato. See the section above — there is no garden project a child remembers more than digging up their own roast potatoes on Christmas morning.
- Runner-bean record. If you’ve already got beans in, measure the longest pod each weekend. Our family runner-bean project started this way and we’ve kept the chart going for years.
If you’ve still got days to fill, our guide to August Bank Holiday 2026 family days out is a good follow-on, and the walled garden at Felbrigg Hall is one of the best places in the country to see what an August kitchen garden in full swing looks like.
Pests and problems to watch for in August
- Cabbage white butterflies. The single biggest threat to brassicas this month. Drape fine garden netting over hoops, check the undersides of leaves weekly for yellow egg-clusters and rub them off with a thumb.
- Aphids on roses and beans. A blast from the hose dislodges most. For heavier infestations, a soapy-water spray (a teaspoon of washing-up liquid in a litre of water) does the job without poisoning the ladybirds.
- Powdery mildew on courgettes and cucumbers. Water at the base, not over the leaves; thin out crowded foliage to get air around the plants; pick off the worst affected leaves and bin them — don’t compost.
- Slugs after rain. A wet August evening is a slug evening. Beer traps and a head-torch hunt the morning after work best for us; copper rings around hostas are worth the money.
- Tomato blight (especially outdoor cordon varieties). Once the leaves go black-brown there’s no saving the plant — pull it up, bin it, don’t compost. Choose blight-resistant varieties like ‘Crimson Crush’ next year.
What to harvest in August
The best month of the kitchen-garden year. Pick small and pick often:
- Courgettes at 15 cm — they double in size in 48 hours.
- French and runner beans while the pods snap cleanly. Older pods get stringy.
- Tomatoes as they colour — early-ripened fruit forces the plant to set the next truss.
- First and second early potatoes — lift carefully with a fork from the side of the row.
- Plums as they soften on the tree; raspberries daily; early apples (Discovery, Beauty of Bath) as they fall to a gentle twist.
- Herbs for drying — pick mid-morning after the dew has gone, hang in bunches in a shed.
Quick checklist — early August in the UK garden
- ☐ Sow winter lettuce, rocket, spinach, lamb’s lettuce
- ☐ Plant out spring cabbages and net them
- ☐ Order Japanese onion sets, autumn garlic, broad beans
- ☐ Plant Christmas potatoes in a bag with the children
- ☐ Sow hardy annuals and biennials for next year’s flowers
- ☐ Plant autumn-flowering bulbs (colchicum, nerine)
- ☐ Order spring bulbs before the best varieties sell out
- ☐ Deadhead roses, cosmos, dahlias, sweet peas
- ☐ Lavender haircut
- ☐ Take semi-ripe cuttings
- ☐ Top up bird baths daily
- ☐ Net brassicas against cabbage white
- ☐ Mulch ahead of any holiday
- ☐ Harvest courgettes, beans, tomatoes, plums little and often
If you’re planning your year ahead, our companion guide on gardening jobs for May covers the spring counterpart, and our Monty Don reading list is the gift guide we send anyone who asks for a serious gardening book.
Frequently asked questions
Is it too late to plant vegetables in August in the UK?
No — early August is one of the most productive sowing windows of the year for autumn and winter crops. Winter lettuces, spinach, oriental leaves, spring cabbages, Japanese onion sets and overwintering broad beans all want to go in this month. Most will crop between October and the following May.
What flowers can I still sow in August in the UK?
Hardy annuals like cornflowers, calendula, Californian poppies, larkspur and nigella sown in August make sturdier, earlier-flowering plants next year than spring-sown ones. Biennials — foxgloves, wallflowers, sweet williams and honesty — also want to be sown now to flower next summer.
Can I sow grass seed in August?
Late August into early September is the best time of year to reseed a lawn or patch bare areas in the UK. The soil is warm, the nights are cooler, and rainfall is more reliable than in spring. Rake the bare patch, scatter the seed, lightly cover with sieved compost and keep watered until germination.
When should I order spring bulbs?
August. The best tulip, daffodil and crocus varieties sell out at the specialist suppliers by mid-September. Order now, plant daffodils from late August onwards, and hold tulips back for planting in November.
How do I keep my garden alive while we’re on holiday?
Five jobs make the biggest difference: harvest everything ripe the day before you leave, mulch the borders and pots with a 5-cm layer of compost, group containers together in dappled shade, rig 2-litre drip-bottles upside-down in the thirstiest pots, and ask a neighbour to water once or twice on the hottest days in exchange for whatever they can pick.
What vegetables overwinter from an August sowing?
Spring cabbage, autumn-sown broad beans (‘Aquadulce Claudia’), Japanese onion sets, autumn-planted garlic, winter lettuce (‘Winter Density’, ‘Arctic King’) and hardy spinach (‘Giant Winter’) all sit through a UK winter and crop between February and May the following year.
Have an August tip we’ve missed? Drop us a line via the contact page — we read every one and they shape the next refresh of this guide.
Thinking ahead to autumn, October and November are the months for planting garlic — one of the easiest crops to grow and one that all but looks after itself over winter.
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