Last edited by shiny on November 11, 2026. View history
Ironbark Pumpkin
A variety of pumpkin
How to sow ironbark pumpkin: Direct seed indoors (and transplant outside after seedlings are hardened off) or outdoors
Sun requirement for ironbark pumpkin: Plant in Full Sun
A round, flat pumpkin remembered by elderly Auckland gardeners for skins so hard an axe was needed to cut them. The rough, bumpy skin turns from green to iron grey when fully ripe, and the dense, sweet flesh is orange. It keeps very well. Transplant at 1 m.
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Ironbark pumpkin facts
Lifespan
Crop cycle
Max altitude
Optimal light
What are growing degree days?
A plant grows with warmth, not with days. A growing degree day is one day's worth of useful warmth: how many degrees the day's average temperature is above the lowest temperature the crop grows at. Add them up from planting and you know how far along the crop is, whatever the calendar says.
Say that lowest temperature is 10°C. A day averaging 17°C gives 7 growing degree days. A day averaging 8°C gives none, as it is too cold for the crop to grow. That is why the same lettuce takes about 50 days in a summer and 90 in an autumn: it needs the same total warmth either way.
For ironbark pumpkin, the FAO EcoCrop database gives a lowest growing temperature of 9°C and a shortest growing cycle of 80 days at its best temperature, about 1280 growing degree days to a first harvest.
Where you've told us where your garden is, we use this and the weather there to predict when your ironbark pumpkin will be ready to harvest. We don't use it for how long a plant lives or when it finishes: we go by what members have logged for that.
Growing ironbark pumpkins
- Sow seeds in pots 4 weeks before planting out
- Dig a pit and fill it with compost 2 weeks before planting out
- Harden off the seedlings 1 week before planting out
- Set or refill beer traps for slugs and snails at planting out every week
- Water deeply at the base 1 week after planting out every week
- Mulch around the plants 3 weeks after planting out
- Hand pollinate the female flowers 6 weeks after planting out
- Pinch out the vine tips 10 weeks after planting out
- Lift fruit onto a tile or board 6 weeks before first harvest
- Check leaves for powdery mildew 8 weeks after planting out every 2 weeks
- Cut pumpkins with a long stalk at first harvest
- Cure the pumpkins in the sun 1 week after first harvest
Plant ironbark pumpkins with
chives
Photos
Photos
Ironbark pumpkin plantings
Video
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Ecological requirements
Data from the FAO EcoCrop database for Cucurbita maxima Duchesne
| Family / Taxonomy | Magnoliopsida Dilleniidae Violales Cucurbitaceae |
|---|---|
| Life form | vine |
| Life span | annual |
| Habit | climber/scrambler/scadent |
| Optimal soil depth | deep (>>150 cm) |
| Optimal soil texture | heavy, medium, light, organic |
| Optimal soil fertility | high |
| Optimal soil drainage | well (dry spells) |
| Optimal soil salinity | low (<4 dS/m) |
| Photoperiod | short day (<12 hours), neutral day (12-14 hours), long day (>14 hours) |
Learn more about ironbark pumpkins
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