August in the UK garden is a month of contrasts. On one hand, it’s peak harvest season with courgettes, beans, tomatoes and salads coming in daily. On the other hand, it’s one of the most important months for planning and sowing crops that will carry you through autumn, winter and even early spring.
Many gardeners overlook August sowing, assuming the season is winding down. In reality, it’s one of the most strategic months of the entire year.
In this guide, we’ll cover exactly what to sow in August in the UK, including vegetables, herbs and flowers that thrive in late summer conditions and form the backbone of winter harvests.
Quick Answer: What Can You Sow in August?
August is a key transition month for fast crops and winter preparation.
August sowing is less about summer abundance and more about securing future harvests.
Vegetables to Sow in August
Lettuce (Winter Varieties)
August is one of the best months to start winter lettuce.
Recommended varieties:
- Winter Density
- Arctic King
- Valdor
- All Year Round (late summer sowing)
Tip: Sow in partial shade to reduce heat stress and bolting.
Spinach (Winter Crops)
Spinach sown in August will overwinter and provide early spring harvests.
Benefits:
- Hardy in cold weather
- Early spring returns
- Low maintenance
Rocket
Rocket grows quickly and is ideal for continuous harvesting.
- Sow in small batches
- Keep soil moist for best flavour
Radishes
Still one of the fastest crops available.
August sowings often produce crisp, autumn-harvest roots.
Spring Onions
Excellent for succession sowing into late summer.
Harvest in 8–10 weeks.
Beetroot (Early August Only)
Early August sowings can still produce small autumn roots.
- Use fast varieties
- Keep well watered
Turnips
One of the most valuable August crops.
- Fast-growing
- Dual-purpose (roots and leaves)
- Ideal for autumn harvest
Pak Choi and Asian Greens
Perfect for cooler late summer conditions.
Best varieties:
- Pak choi
- Mizuna
- Tatsoi
- Mustard greens
Tip: Protect from flea beetles with netting.
Kale (Winter Harvest Crop)
August is one of the final main sowing windows for kale.
- Extremely hardy
- Improves after frost
- Long harvest period
Winter Cabbage
A key crop for overwintering.
- Sow in seed trays or modules
- Transplant later in the season
Herbs to Sow in August
Herbs still grow well in late summer, especially in cooler conditions.
Coriander
Best sown in small batches to avoid bolting.
Parsley
Slow to germinate but reliable for autumn and winter use.
Dill
Fast-growing and ideal for late summer sowing.
Chives
Perennial herb that can be sown or divided.
Flowers to Sow in August
August is still useful for fast-growing and late-season flowers.
Calendula
Continues flowering into autumn and attracts pollinators.
Nasturtiums
Quick-growing and excellent for filling gaps in beds.
Cornflowers
Can still be sown early in August for late blooms.
Sweet Peas (Early Autumn Prep)
Some gardeners begin preparing autumn sowings for stronger spring plants.
Green Manure Crops (Important in August)
August is one of the best months to improve soil health.
Popular options:
- Mustard
- Clover
- Phacelia
Benefits:
- Suppress weeds
- Improve soil structure
- Add nutrients back into soil
What Can Be Planted Outdoors in August?
August planting is more limited but still important.
You can plant:
- Salad plug plants
- Late brassica seedlings
- Perennial herbs
- Strawberries (late summer planting in some regions)
MyGrowPal helps you plan for year-round growing. Set your UK postcode and the app optimises sowing dates for autumn and winter crops, ensuring continuous harvests even as summer fades.
August Gardening Jobs
Harvest Management
August is peak harvest season! Regularly pick crops like beans, courgettes, tomatoes, salad leaves, and beetroot to encourage further production and prevent gluts.
Watering Is Critical
Late summer heat and dry spells require careful watering. Water deeply and less frequently, focusing on the root zone, and use mulch to retain moisture.
Prepare for Autumn
Start planning for your winter crops, deciding which beds will host overwintering vegetables. Consider sowing green manure in empty patches to improve soil.
Pest Control
Warm weather still supports high pest activity. Watch for aphids, caterpillars, slugs, and flea beetles. Early detection and organic controls are key.
Succession Sowing
Continue sowing small batches of fast-growing crops like lettuce, radishes, spring onions, and spinach every 2-3 weeks to ensure fresh produce into autumn.
Common August Sowing Mistakes
Assuming the Season Is Over
Many gardeners ease off in August, thinking the main sowing season is done. In reality, it’s a critical month for sowing crops that will sustain you through winter and early spring.
Letting Soil Dry Out
Despite decreasing daylight, August can still be hot and dry. Dry soil leads to poor germination and establishment of young seedlings. Keep new sowings consistently moist.
Not Netting Crops
Flea beetles and birds are still active. Young brassica seedlings (kale, cabbage, Asian greens) are particularly vulnerable and can be destroyed quickly without netting.
Ignoring Winter Planning
Missing August sowing windows for hardy winter crops means missing out on fresh produce during the colder months. Plan strategically to secure those future harvests.
Using MyGrowPal to Plan August Sowing
August is a turning point in the gardening year, where harvesting, sowing and planning all overlap heavily.
MyGrowPal helps gardeners stay in control by turning seed collections into a structured, seasonal growing system.
Frequently Asked Questions
Is August too late to sow vegetables in the UK?
No. August is essential for winter and autumn crops.
What vegetables can I sow in August?
Lettuce, spinach, kale, turnips, radishes, spring onions and Asian greens all work well.
Can I still grow lettuce in August?
Yes, but choose heat-tolerant or winter varieties.
What flowers can I sow in August?
Calendula, nasturtiums and cornflowers are good late-summer options.
What is the most important thing to sow in August?
Winter crops like kale, spinach and winter lettuce are the most important for year-round growing.
Final Thoughts
August is one of the most strategic months in the UK gardening calendar. While it is a peak harvesting period, it is also the foundation for autumn and winter productivity.
Gardeners who use August wisely can ensure continuous harvests well beyond summer.
And with MyGrowPal, you can manage this transition seamlessly—tracking seeds, planning winter crops, managing sowing schedules and staying ahead of weather changes so your garden stays productive all year round.