Acorn squash
Cucurbita pepo
Also known asPepper squash · Des Moines squash · Table queen squash
Environment
The bounded range this crop tolerates.
Climate and zones
- USDA zones
- 3–12 (winter low around -40°C)
- Frost
- frost sensitive (dies at first frost)
- Season
- warm (summer, frost-sensitive)
Growing systems
Root mass: heavy. Thin-channel systems can't hold this crop.
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 due to the vine size and pollination requirement. Best suited to Dutch bucket systems or large container setups with trellis support for vertical growth. EC 2.0-3.5 mS/cm. pH 5.5-6.5. Temperature: 20–30°C daytime, minimum 15°C at night. Full sun or very strong supplemental lighting (DLI 20-30 mol/m2/day). Nutrient demand is heavy, especially for potassium and calcium during fruiting; increase K in the feed once flowers appear. Pollination must be done by hand in indoor systems (no bees): transfer pollen from male flowers (thin straight stem) to female flowers (small swelling at the base) using a small paintbrush or cotton swab, ideally in the morning when flowers are freshly open. Each plant produces 3-5 fruits over a season. Harvest when the skin hardens and the stem dries (about 80-100 days from transplant). The vine needs strong support if trellised; each fruit weighs 0.5–1 kg and can pull the vine off a weak trellis. Powdery mildew is the most common disease; good airflow and avoiding wet foliage help. Not the most practical hydroponic crop for small systems, but doable in larger setups. Space requirements are significant: each plant needs 1-2 square meters of growing area. In vertical systems, train the main vine up a strong trellis and support individual fruits with mesh slings once they reach tennis-ball size. Companion planting with lettuce or herbs beneath the trellis makes efficient use of floor space. The plants are heavy feeders throughout the fruiting period; monitor EC weekly and top up nutrients as the reservoir depletes faster than expected.