When to plant Butternut Squash in London

Sow seeds on their edge around 14th March - 21st March, about 2 cm deep in small pots. Keep them at 18–21 °C. Do not sow too early, as seedlings grow quickly and can become leggy or root-bound before planting out.

Move seedlings on once they have their first true leaves, from 28th March. Handle them by the leaves, not the stem, and keep them growing on in bright light so they do not become lanky.

Gradually acclimatise plants around 4th April - 25th April. Put them outside for a few hours at a time, then bring them back in if cold nights return, until they are ready for planting out.

Set plants into rich soil or a compost-enriched mound from 18th April once frost risk has passed. Water them in thoroughly straight after planting, then give each plant plenty of room to run.

From 18th April, keep the young growth well watered and protect it with fleece or a cloche if nights turn cold. Lift developing fruit onto dry boards or tiles so they do not sit on damp soil and rot.

From 18th April to 10th November, water deeply at the base whenever the soil starts to dry. Feed every 14 days with a high-potash fertiliser once fruits begin to swell, and keep the leaves dry to limit mildew.

Harvest from 20th October to 10th November when the skin is hard, the colour is full, and the stalk is starting to cork. Cut each squash with a short stalk attached, then cure the fruits in a warm, dry, airy place for 10-14 days to harden the skin for storage.