Edible plant · fruiting

Butternut squash

Cucurbita moschata

Also known asButternut pumpkin (Australia/NZ) · Calabaza butternut · Moschata squash

beginner warm-season frost-sensitive aquaponic-ready single

Use in garden planner

Days to harvest

95–120

Yield / plant

2kg

Spacing

120 cm

Daily light

22–30DLI

Environment

The bounded range this crop tolerates.

Temperature

5152535

18–30°C

45.578.5

6–6.8

EC (hydro)

01234

1.8–2.4 mS/cm

Daily light

5152535

22–30 mol/m²/d

✓Single harvest

Climate and zones

USDA zones: 3–12 (winter low around -40°C)
Frost: frost sensitive (dies at first frost)
Season: warm (summer, frost-sensitive)

·Outdoor year-round (in zone)

✓Outdoor in growing season

✓Unheated greenhouse / hoop

·Heated greenhouse

·Indoor (heated home)

·Indoor hydroponics + grow lights

Growing systems

Root mass: heavy. Thin-channel systems can't hold this crop.

·Deep water culture (rafts)

·NFT channels

·Vertical / aeroponic tower

·Drip / Dutch buckets

✓Media bed (ebb and flow)

·Wicking bed

✓Soil bed

Growing media

Medium	pH effect	Retention	Bacterial surface
Soil-based mix (Potting soil)	varies	high	high

Nutrient demand by stage

NPK ratios are relative weights. EC targets shift through the plant's life.

Stage	N	P	K	EC (mS/cm)
seedling	2	1	1	1.2
vegetative	3	1	2	1.8
flowering	1	2	3	2
fruiting	1	2	3	2.2

Companion-growing notes

Heavy uptake of potassium, nitrogen. Co-grown crops with the same demand will end up deficient even at "correct" EC.
High transpiration. Regular reservoir top-ups needed during fruiting.

Aquaponics suitability

Compatible

Fish waste provides enough nitrogen for healthy growth. Supplemental potassium, calcium, and iron may still be needed depending on fish stocking density.

Care notes

A challenging hydroponic crop given the vine size, pollination needs and long season, about 90 to 120 days from transplant. Use Dutch bucket or large containers (around 30 L) with strong trellis support. Hold EC around 1.8-2.4 mS/cm and pH 6.0-6.8. It is warm-season, best at 20–30°C, and frost kills the vine. Give very high light, 22-30 mol/m2/day. Indoors it needs hand pollination: move pollen from male to female flowers with a brush or swab. Each vine sets 3 to 6 fruits, and when grown vertically the developing fruit should be cradled in mesh slings. Feeding is heavy, especially potassium during fruit fill. Harvest when the skin is uniformly tan and hard enough that a fingernail won't dent it and the stem has gone brown and corky, then cure at 25–30°C for 10 to 14 days to harden the skin for storage. The long season and space needs make it a crop for large operations or outdoor aquaponics.

Notable varieties

Cultivar	Type	Origin	Days	Notes
Waltham Butternut	open pollinated	Massachusetts Agricultural Experiment Station, 1970	105	AAS winner, the standard home-garden butternut. Uniform 1.5-2 kg fruit, long thin neck. The variety most catalog 'butternut squash' actually is.
Honeynut	hybrid	Cornell University (Richard W. Robinson, 1980s; cultivar developed by Michael Mazourek), released 2015 via Row 7 Seed	110	Miniature butternut, 400-700 g, dark orange flesh, much sweeter than Waltham. Bred from a buttercup x butternut cross by Richard W. Robinson in the 1980s, later developed into a market cultivar by plant breeder Michael Mazourek and popularised with chef Dan Barber; released in 2015.
Tahitian Melon Squash	heirloom		120	Long-cycle giant butternut-type (4-8 kg), excellent storage (6-12 months), distinct flavor. Only suitable for zones 6+ with long seasons.