Pumpkin (squash): Sowing, planting and harvest calendar
How do you sow pumpkins under cover?
Sow pumpkins in spring in pots with drainage holes filled with seed compost. Sow one seed per pot about 1–2 cm deep. Keep the compost slightly moist without soaking it, and the pots warm, at around 20 °C. If you use a clear cover to retain moisture, remove it as soon as seedlings emerge.
After germination, give the seedlings good light. Gradually acclimatise them to outdoor conditions and wait until the soil is warm and all risk of frost has passed before planting them out.
Plant in a sunny spot with fertile, well-drained soil, keeping the root ball intact. Adjust spacing to the growth habit stated for the variety: trailing types need more room. Watch for pests and identify problems before taking action, without routine preventive treatments.
Label the pots with variety and date: a compact plant and a strongly trailing pumpkin will need different amounts of room. Watch for roots filling the container and pot on carefully if planting must wait. Support the whole root ball rather than pulling on the stem. Space the plants so their large leaves receive light without overlapping one another.
How do you sow pumpkins outdoors?
Sow pumpkin seeds directly in their final position once the soil is warm and all risk of frost has passed. Choose a sunny spot with fertile, well-drained soil. Remove weeds and add mature compost if needed.
Sow at individual sites about 2–3 cm deep, following the seed packet instructions. Allow enough room for trailing stems instead of using a fixed one-metre spacing. If several seedlings emerge at one site, keep the strongest.
Keep the soil moist during germination without overwatering. Watch for slugs and snails around young plants. Sowing under cover remains an option in cool climates; harvest depends on the variety and available warmth, with no guaranteed autumn crop.
Mark each position so you do not tread on the sowing before emergence. If you use a cloche, check the temperature underneath and ventilate in sunshine. To remove a surplus seedling, cut it at the base rather than pulling roots tangled with those of the retained plant. Leave a permanent access path for watering and checking future fruits once the vines cover the ground.
How do you plant out pumpkins?
Plant young pumpkins in a sunny spot with fertile, well-drained soil. Remove weeds and add mature compost if needed. Wait until the soil is warm and the risk of frost has passed.
Gradually acclimatise plants raised under cover before moving them outdoors. Water the root ball, then plant it without breaking the roots, at the same depth as in the pot. Adjust spacing to the variety and leave enough room for trailing stems. This calendar covers seedlings; direct sowing is covered by the sowing calendar.
Water at the base after planting, then adjust watering to the weather without soaking the soil. Mulch while keeping the stem base clear. Inspect young plants and identify signs of disease or pests before taking action.
Prepare the hole before removing the plant from its container to limit root exposure. Support the root ball from underneath without pressing on the soft stem. The crown is the junction between stem and roots: do not pack mulch against this area. After watering, check that the soil has not washed away from the root ball and that the plant remains upright.
How to care for this plant
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Keep fruits off the soil
When squash fruits develop on the ground, place a board or tile beneath them to separate them from damp soil without pulling the stems.
When do you harvest pumpkins?
For storage, let pumpkins reach full maturity: the skin hardens and the stalk begins to dry. Timing depends on sowing, variety and climate. Harvest before frost rather than waiting for a fixed autumn date.
Cut with a clean, sharp tool, leaving a section of stalk attached to the fruit. Handle the squash without knocking it and do not carry it by the stalk. Damaged or insufficiently ripe fruits store less well and should be used promptly.
Store healthy, ripe fruits in a dry, ventilated, frost-free place at around 10–15 °C. Keep them from touching and check regularly. Storage life varies; remove any showing signs of rot.
Inspect the underside of fruits before selecting them for storage. A soft or wet area needs careful checking even if the upper surface looks intact. To carry a large pumpkin, support it underneath with both hands or get help if necessary. Arrange stored fruits so you can inspect them without moving every one each time, and promptly remove any that begin to deteriorate.
Pumpkin (squash)
- Type : Vegetables
- Subtype : Fruiting vegetables
- Botanical Family : Cucurbits
Characteristics
- Lifecycle : Annual
- Exposure : Full Sun
- Frost Hardiness : Frost Sensitive
- Cultivation Difficulty : Easy
- Mature height : 50 cm
Sowing & Planting
- Greenhouse Growing : Not Required
- Sowing Depth : 2 cm
- Plant Spacing : 120 cm
- Row Spacing : 120 cm
Maintenance
- Maintenance : Moderate
- Water Requirements : High
Other characteristics
- Soil Type : Humus-rich
- Soil pH Preference : Neutral
- Pest Sensitivity : Moderate
- Disease Sensitivity : Moderate
- Weed Sensitivity : Moderate
- Pollination : Insect-pollinated
- Propagation : Sowing