How to Grow Carrots (UK guide)
Crisp, sweet carrots are an allotment staple, easily grown from seed in the UK. They add colour and crunch to your meals and can be harvested young as baby carrots or allowed to mature for a larger crop.
How to grow carrots
Carrots are best sown directly outdoors in loose, stone-free soil. They need a sunny spot and regular watering, especially in dry spells, for the sweetest roots. Sow thinly to avoid overcrowding and reduce the risk of carrot fly.
Grown Vegetables
Quick to grow, nutritious and easy from seed.
How to Grow Carrots from Seed
- 01Rake soil until fine and remove all stones or debris
- 02Sow seeds thinly in shallow drills 1cm deep, spacing rows about 20cm apart
- 03Lightly cover seeds with soil and gently firm down
- 04Water well and keep soil moist until seeds germinate
- 05Thin seedlings as they grow to avoid overcrowding
You will need
- 01Sunny, open site
- 02Loose, stone-free soil or deep containers
- 03Consistent moisture
- 04Protection from carrot fly
- 05Light, balanced feed if soil is poor
Plant Calendar
What carrots need
Loose, sandy soil
Well-drained, stone-free soil encourages straight, healthy roots.
Adequate depth
Deep soil or containers give room for long roots to develop fully.
Sunlight
Carrots need a minimum of 6 hours of direct sunlight per day.
Consistent moisture
Regular watering gives sweeter roots and prevents splitting.
Carrots: FAQs & Common Problems
Carrots FAQs
Carrots are usually ready for harvest 12–16 weeks after sowing. Gently ease them from the soil when they reach finger thickness, or when their shoulders show above ground. You can pick them as needed from mid-summer to autumn.
Yes, carrots can be grown successfully in deep containers with at least 30cm depth. Use a free-draining, peat-free compost mixed with a little sand for best results. Ensure good drainage to prevent root rot and for straight growth.
Carrots are light feeders. Avoid high-nitrogen fertilisers, which encourage leafy growth but poor roots. Use a balanced, low-nitrogen fertiliser mixed into the soil before sowing if your soil is poor. Excess feeding is rarely needed in rich, well-prepared soil.
The main pest for carrots in the UK is carrot fly, which causes tunnelling in roots. Protect your crop by using fine mesh or sowing carrot fly-resistant varieties. Also watch for slugs and root rot if soil is too wet.
GROW: Grow your own fruit and vegetables from the earth around you.
