Winter Squash
Cucurbita spp.
A long season and a lot of room, in exchange for something that keeps until spring.

Know your species
Cucurbita pepo (acorn, delicata, spaghetti) is quickest but stores least well and is most vulnerable to vine borer. C. maxima (hubbard, kabocha, buttercup) has the best eating quality and biggest fruit but needs the longest season and most room. C. moschata (butternut) has solid stems that largely resist squash vine borer and stores longest - if borers ruin your squash every year, grow moschata.
Space and soil
Vining types run ten to fifteen feet. Give them a corner, let them run into paths, or grow them up a strong trellis with slings supporting the fruit. They are heavy feeders: work in plenty of compost and side-dress once the vines start to run.
Direct sow after the soil warms
Sow at 65F soil, two or three seeds per hill, thinning to one or two. Count backwards from first frost using the days-to-maturity figure and add two weeks of margin - a squash caught by frost before the rind hardens will not store.
Pests
Squash vine borer, squash bugs and cucumber beetles all apply, and cucumber beetles additionally spread bacterial wilt. Row cover until flowering protects young plants but must come off for pollination. Moschata types are far less bothered by borer.
Keep fruit off wet soil
Slip a board, tile or pad of straw under each developing fruit. It prevents the underside rotting and keeps the skin clean, which matters for storage life.
Ripe means hard, not coloured
Harvest when the rind resists a thumbnail and the stem has corked and dried. Colour alone is unreliable. Cut rather than pull, leaving two to four inches of stem - a squash without its stem rots at the shoulder within weeks.
Curing is not optional
Ten days somewhere warm (around 80F) and dry hardens the skin, heals surface nicks and converts starch to sugar. Cured squash keeps for months and tastes better; uncured squash does neither. Acorn squash is the exception and should go straight to cool storage without a warm cure.
Storage
Store at 50-55F, dry, in a single layer with air around each fruit - not touching, and not in a damp basement. Check monthly and use any with soft spots. Butternut keeps four to six months, hubbard and kabocha three to six, acorn only one to two.
- Habit
- Vining (bush types exist)
- Days to harvest
- 85-120
- Spacing
- 36-48 in
- Sun
- Full
- pH
- 6.0-7.5
- Soil temp
- 65F+
- Cure
- 10 days, 80F
- Storage
- 3-6 months