Now is a good time to sow Radish. Follow the sowing guide below.
Growing Calendar
This month: May
Log to journalStart seeds indoors this week
- •Fill tray with compost
- •Sow seeds evenly
- •Cover lightly with soil
- •Water gently
- •Place in warm light spot
Watch Out For
Flea beetle damages leaves
cover with fine mesh netting from sowing and keep plants well watered to grow quickly through the vulnerable seedling stage
Bolts if left too long
harvest within 4–6 weeks of sowing; radishes left longer turn woody, hollow and very hot
Overcrowding reduces root size
thin to 2.5cm apart promptly after germination for best results
Grown Organically
Every method in this guide works with natural systems — no synthetic chemicals, no shortcuts.
Read our approachCommon Questions
About growing Radish in the UK
How quickly do radishes grow?
Summer radishes are the fastest vegetable in the garden — ready in just 4–6 weeks from sowing. Sow a short row every 2–3 weeks for a continuous harvest from March to September. Winter radishes take longer (8–10 weeks) but are much larger.
Why are my radishes all leaves and no root?
Leafy radishes with poor root development are usually caused by overcrowding (thin to 5cm apart), too much nitrogen in the soil, or sowing in a shaded position. Radishes need full sun and regular watering to develop well-formed roots.
Why do my radishes taste too hot?
Radishes become hot and woody when they mature too slowly in dry or cold conditions, or when left in the ground too long after reaching harvesting size. Harvest promptly — summer radishes become unpleasant if left more than a few days past peak.
Can radishes be grown in containers?
Yes — radishes are ideal for containers and window boxes. Use at least 15cm depth for round varieties. Sow densely, thin to 5cm, and harvest quickly. Their short growing time makes them perfect for repeated container sowings.
Member guides
There's more to growing Radish than this guide covers.
Seasonal reminders, deeper guides, and the small adjustments that change a harvest.
