Tromboncino Zucchini

Cucurbita moschata

Also known as: Tromba d'Albenga, Zucchetta Rampicante, Trombetta


An Italian heirloom quite unlike the bush zucchini most gardeners know — a vigorous climbing vine bearing long, pale green, trumpet-shaped fruit with a slim curved neck and a small bulb at the blossom end. Picked young at 20–30cm, the flesh is firm, nutty, and completely seedless along the entire neck, cooking down slower and holding its shape better than an ordinary zucchini. Left on the vine to mature, the fruit stretches to 60cm or more, deepens to tan, and hardens into a butternut-flavoured winter squash for autumn storage. Powdery mildew resistant, a C. moschata trait that keeps it producing through late summer when bush zucchini have long given up. Vigorous climbing vine — needs a strong trellis or arbour and serious room to run.

Days to harvest 60–80 days from sowing for tender young fruit; 90–110 days for mature keepers
Fruit size Long, curved, trumpet-shaped fruit — best picked young at 20–30cm; can reach 60cm+ if left to mature
Sowing depth 2cm
Germination 6–10 days at soil temperature 21–30°C
Spacing 60–90cm between plants along a strong trellis
Aspect Full sun; deep, well-drained soil rich in organic matter
Frost tolerance Sensitive to frost — sow after last frost only

Growing notes

A warm, sunny position with a serious climbing structure suits it best. Tromboncino throws long, heavy vines quickly and rewards being trained upward — trellised fruit hangs straight, cures cleanly, and stays clear of soil-borne rots and slugs.

Soil preparation: Deeply worked beds with generous well-rotted compost and aged manure. Squash are heavy feeders — build the bed before sowing and top-dress as the vine takes off.

Sowing method: Sow 2–3 seeds per station 60–90cm apart along the base of a trellis, either direct into warm soil or into large pots for transplant, then thin to the strongest seedling per station.

Support: A strong trellis, arbour, or overhead frame is essential — vines readily reach 3–5m in a warm season and hanging fruit grows straight, long, and unblemished.

Watering & feeding: Deep, consistent watering at the base. Overhead watering invites disease, though the moschata species is more mildew-tolerant than bush zucchini. Side-dress with well-rotted manure or a balanced liquid feed once flowering starts.

Harvest: For summer eating, pick young at 20–30cm while the skin still nicks under a fingernail. Kept picked, the vine will keep setting fruit right through the season. For winter storage, leave selected fruit on the vine to lengthen and mature — skin will deepen to tan and the shell will harden. Cure in a warm dry spot for a week before storing, and treat as you would a butternut.

Timing: Tender young fruit ready around 60–80 days from sowing; mature keepers ready around 90–110 days.

Key features

  • Long, curved trumpet-shaped fruit — seedless along the entire neck
  • Firm, nutty flesh that holds its shape when cooked
  • Dual purpose: young for summer squash, mature for winter storage
  • Powdery mildew resistant — one of the healthiest summer squashes
  • Long cropping window from a single vine
  • Italian heirloom with centuries of home-garden pedigree

Short season tips


Direct sow into warm ground from mid-spring to early summer once frost risk has passed. In Coonabarabran and similar inland zones, that means mid-November onwards. If time is tight, start seed indoors in large pots 3–4 weeks before transplanting — cucurbits resent root disturbance, so handle carefully and move on with the root ball intact. Tromboncino's mildew resistance and long cropping window make it a strong choice for gardens where regular zucchini fizzle out before autumn.

  • Spring
  • Summer

Annual

  • Corn, climbing beans (if given separate trellis), nasturtium, borage, marigold
  • Potatoes, other Cucurbita moschata varieties within cross-pollination distance if saving seed. Does cross with butternuts and other moschata squashes, but not with C. pepo (bush zucchini, patty pans) or C. maxima (Red Kuri, pumpkins)


An Italian heirloom from Liguria, in particular the coastal town of Albenga where it takes one of its regional names — Tromba d'Albenga, the trumpet of Albenga. Long cultivated in northern Italian gardens for its distinctive shape, seedless neck, and generous cropping habit, it has travelled steadily outward through the twentieth and twenty-first centuries and become a favourite of gardeners looking for a summer squash that can climb, resist mildew, and hold its own into autumn as a keeping squash.