Pumpkin Growing Guide
Pumpkins are a type of winter squash, traditionally known for their large, rounded, orange fruits. They are botanically classified as cucurbits and are closely related to squashes and courgettes, mainly varieties of Cucurbita pepo or Cucurbita maxima. Easy and fun to grow, they provide vibrant fruits for Halloween carving or winter storage. They are tender plants requiring a warm, sunny site and plenty of water.
This guidance applies to the crop in general. Individual varieties and local conditions can differ.
Planting information
Sow pumpkins indoors in mid-to-late April, one seed on its side 1cm deep per 7.5cm pot or module of peat-free compost. Germinate at 18–21°C in a warm, bright place; water young plants regularly and repot as roots fill the container. Alternatively, sow outdoors after frost in late May or early June, 2.5cm deep, thinning each site to one strong plant. Harden off indoor-raised or bought plants before planting out after the last frost. Keep roots intact, firm gently and water well. Allow about 90cm for bush plants or 1.5m for trailing types, checking the variety's guidance. Only very compact bush varieties suit growing bags or containers: one plant per bag or container at least 45cm wide. Leave room for airflow and protect young plants from slugs and snails.
Harvesting information
Let pumpkins mature and colour up on the plant before harvesting in autumn. Keep them on the plant as long as possible, but harvest before the first frost, or protect fruits with straw, fleece, or cardboard, as frosted pumpkins cannot be stored. Cut pumpkins from the plant with at least 10cm of stem still attached to prevent rotting. Prepare pumpkins for storage by laying them out in the sun for 7 to 10 days, either outdoors or in a greenhouse or coldframe, to harden (cure) their skins.
Storage information
Store fully ripened pumpkins in a well-ventilated place at 10–15°C, ensuring the fruits do not touch. Depending on the variety, they should keep for at least three months, and up to six in ideal conditions. Check them regularly for signs of deterioration or rot.