Pompoen

Cucurbita maxima

Engels: Pumpkin

vegetableCucurbitaceaeEetbaar

Pompoen (Cucurbita maxima) is a edible vegetable from the Cucurbitaceae family that grows up to 50cm tall. This plant thrives in full sun and requires moderate maintenance. Blooms in summer with yellow flowers and attracts bees.

Hoogte

30–50 cm

Breedte

200–400 cm

Zonligging

full sun

Waterbehoefte

high water needs

Grondsoort

loam

Onderhoud

moderate maintenance

Bloeitijd

summer

Bloemkleuren

yellow

Ecologische waarde

Trekt bijen aan

Verzorgingskalender

Taak	Jan	Feb	Mrt	Apr	Mei	Jun	Jul	Aug	Sep	Okt	Nov	Dec
🌱Planten
✂️Snoeien
💧Bemesten
🍎Oogsten

Care tips

Planting

Pumpkins demand full sun and rich, moisture-retentive loam to produce their famously large fruit. Choose a sheltered spot with at least six hours of direct sunlight daily. In temperate Europe, sow seeds directly outdoors in May once all risk of frost has passed and soil temperature reaches at least 12°C. Alternatively, start seeds indoors in late April in 7–9 cm pots, sowing two seeds per pot on their side about 2 cm deep, and transplant the strongest seedling after hardening off in mid to late May. Prepare the planting site thoroughly. Pumpkins are greedy feeders, so dig in at least two buckets of well-rotted manure or garden compost per square metre a few weeks before planting. The soil should be free-draining yet able to hold moisture; heavy clay benefits from added organic matter and grit, while light soils need generous compost to improve water retention. Space plants 150 cm apart in all directions—pumpkins sprawl vigorously, with vines reaching 2–4 metres, and crowding invites fungal problems and limits fruit size. Plant or transplant so the base of the stem sits just above soil level to reduce the risk of stem rot. Water in thoroughly after planting, soaking the root zone deeply. Immediately after planting, apply a 5 cm layer of well-rotted compost or straw mulch around each plant, keeping it clear of the stem itself. This suppresses weeds, conserves moisture, and keeps developing fruit clean. In exposed gardens, consider using cloches or fleece for the first two weeks to help young plants establish in cooler May weather.

Pruning

Pumpkins don't require pruning in the traditional sense, but targeted trimming in July significantly improves fruit size and ripening. The main goal is to direct the plant's energy into a manageable number of fruits rather than endless vegetative growth. In July, once several small fruits have set and reached about the size of a tennis ball, decide how many pumpkins you want each plant to carry. For large exhibition-type fruit, limit each plant to one or two pumpkins; for medium-sized culinary pumpkins, allow three to four per plant. Remove any additional fruitlets and flowers by pinching them off at the base. At the same time, pinch out the growing tip of each main vine two leaves beyond the last fruit you're keeping. This stops the vine from extending further and channels resources into swelling the remaining pumpkins. If side shoots are rampant and tangling, trim back a few of the least productive ones, but leave enough foliage to fuel fruit development—each pumpkin needs several large leaves to photosynthesize effectively. Use clean, sharp secateurs or simply pinch soft growing tips with your fingers. Remove any yellowing or mildewed leaves at the base of the plant throughout the season to improve air circulation, but avoid heavy defoliation. Later in the season, around late August or early September, you can trim away excess foliage shading the ripening fruit to encourage better colour and skin hardening, but leave sufficient leaf cover to prevent sunscald on very hot days.

Maintenance

Pumpkins have high water needs, especially during fruit development. Water deeply two to three times per week in dry weather, delivering at least 10–15 litres per plant each time. Focus water at the base of the plant rather than overhead to minimise the risk of powdery mildew, a common fungal issue in the Cucurbitaceae family. In hot July and August weather, daily watering may be necessary. Reduce watering in September as fruit begins to ripen; drier conditions at this stage improve flavour and storage quality. Feed generously throughout the growing season. Apply a high-nitrogen liquid feed (such as comfrey tea or a balanced tomato fertiliser) every two weeks in May and June to promote strong vine growth. Switch to a high-potassium feed in July, when fruit is swelling, to encourage size and sweetness. Continue fortnightly feeding until late August. Pumpkins are frost-tender annuals and will not overwinter. Harvest all fruit before the first autumn frosts in October. If powdery mildew appears—white, powdery patches on leaves—improve spacing and air flow, remove affected foliage, and avoid wetting leaves when watering. Slugs can damage young plants in May; use barriers or organic pellets. Aphids occasionally cluster on shoot tips; squash by hand or spray with soapy water. Refresh mulch around plants in mid-summer if it has decomposed. Place a tile, wooden board, or straw pad under developing fruit to prevent soil contact, which can cause rot and slug damage as the pumpkins mature.