Blue Banana Pumpkin

Cucurbita maxima (cucurbit)

Also known as: Guatemalan Blue Banana Squash, Blue Banana Squash

A striking heirloom that's been grown in Central and South America for over a thousand years — long, cylindrical fruit up to 50cm, wrapped in a dusty blue-grey rind faintly striped in green. Slice one open and the contrast is spectacular: dense, deep orange flesh that cooks down smooth, sweet, and nutty with a subtle fruitiness. One fruit feeds a family for a week and stores 6 months or more in a cool dry place. Vigorous vines run 3-4 metres so give it room. A real conversation-starter on the market stall — customers stop for the colour and stay for the flavour.

Days to harvest 90-100 days

Fruit size 35-50cm long, 3-4.5kg — elongated, cylindrical, banana-shaped

Sowing depth 20mm

Germination 8-12 days at 21-35°C

Spacing 60cm apart in rows 150cm apart (vines sprawl 3-4m)

Aspect Full sun, moist well-drained soil

Frost tolerance Frost tender — grown as an annual; sow only after all frost risk has passed

Growing notes

Choose a sunny spot with room to sprawl — vines will run 3-4 metres and the fruit gets heavy, so trellising isn't practical for this one. Plant on a small mound of enriched soil to give roots warmth and drainage. Watch for powdery mildew in humid weather — good spacing and morning-only watering help.

Soil preparation: A hungry feeder. Dig in generous compost and well-rotted manure before planting, and side-dress with more when fruit starts to set. Aim for pH 6.0-6.8.

Support: Ground-grown only — fruit gets too heavy for trellises. Slip a tile, board, or thick straw pad under each developing pumpkin to keep it off wet soil and prevent rot.

Harvest & cure: Cut fruit with 5cm of stem still attached once the vine dries off and the skin resists a thumbnail. Cure in a warm, dry, airy spot for 10-14 days to harden the rind, then store somewhere cool (10-15°C) and dry. Properly cured fruit keeps 6 months or more. Cut portions keep 5 days in the fridge wrapped in plastic.

Key features

Rare heirloom — 1000+ years of cultivation in the Americas
Dramatic blue-grey rind, deep orange flesh
Sweet, nutty, subtly fruity flavour
Long-storing keeper — 6+ months cured
Huge fruit — 3-4.5kg (6-10 lb) each
Open-pollinated, seed-saving friendly

Short season tips

Blue Banana needs 90-100 warm days, so in cooler NSW areas start seeds in pots 2-3 weeks before your last frost and transplant carefully (cucurbits hate root disturbance — use biodegradable pots you can plant whole). Warm the soil under black plastic for two weeks before planting out to bring soil temperature into the 21°C+ range. If cool weather threatens before fruit fully matures on the vine, cut with a long stem and finish curing indoors somewhere warm and dry.

Spring
Summer

Annual

Corn (classic "three sisters" trio) • Climbing beans (fix nitrogen, share the space vertically) • Nasturtium (trap crop for aphids and squash bugs) • Marigold (repels beetles and nematodes) • Borage (attracts pollinators, critical for fruit set) • Radish (trap crop for cucumber beetles) • Oregano (repels pests, ground cover)

Potatoes (heavy feeders, compete for the same nutrients) • Brassicas (cabbage, broccoli — compete heavily and attract different pests) • Other Cucurbita maxima varieties if seed saving (cross-pollination — Queensland Blue, Jarrahdale, and Hubbard types will cross with it) • Fennel (inhibits most vegetable growth) • Don't repeat in the same bed each season — rotate to break the squash bug and vine borer cycle

A true ancient heirloom, cultivated in Central and South America for over 1,000 years before European contact. Also known as Guatemalan Blue Banana, it was brought to the United States in the 19th century but faded from mainstream cultivation as commercial squash varieties took over. Now experiencing a revival among heirloom growers and seed savers who value it for its extraordinary storage, high yields, and eye-catching looks.