When to plant Nasturtiums in Cambridge

Sow seeds into individual modules around 9th April - 23rd April. Cover with 1 cm of compost and keep the compost just moist while seedlings emerge.

When seedlings have a couple of true leaves, from 23rd April to 21st May, move them into individual pots if their modules are crowded. Handle them by the leaves, not the stems, and keep them in bright light so they do not become leggy.

From 7th May to 28th May, move plants outside for longer each day before planting them out. Protect them from cold nights and strong wind, and keep them in a sheltered spot at first.

Once the soil has warmed and frost risk has passed, plant out your hardened-off seedlings around 21st May - 4th June. Space them 30 cm apart, water in thoroughly straight after planting, and give them a sunny spot with free-draining soil.

From 20th June to 19th October, remove fading flowers regularly so the plant keeps producing new blooms instead of setting seed. Water only in dry spells, because rich soil and heavy feeding usually mean more leaves and fewer flowers.

Pick flowers and young leaves from 20th June until 19th October. Harvest in the morning for the best flavour, and take only a few leaves from each plant so it keeps flowering well.