Rocoto

Quick facts

Category

fruiting

Difficulty

intermediate

Days to harvest

150 to 200 days

Harvest type

continuous production over weeks or months

Spacing

90 cm between plants

Environment

Temperature

12–26°C

pH

5.8 to 6.8

EC (hydroponic)

1.8 to 2.6 mS/cm

Daily light

18 to 28 mol/m²/day

Climate and zones

USDA zones

8 to 12 (winter low around -12°C or warmer)

Frost tolerance

tolerates light frost

Season

cool (spring and fall crops)

Viable growing environments:

• outdoor in growing season (annual)
• unheated greenhouse / hoop house
• heated greenhouse
• indoor (heated home)

USDA zone bounds reflect outdoor year-round survival. Anywhere outside the bounded zone range, this crop still grows as an annual in the warm months (outdoor_seasonal), under cover (greenhouse), or indoors under lights.

Growing systems

Rocoto works in:

• media bed (ebb and flow)
• soil bed

Root mass is heavy - thin-channel systems (NFT, vertical towers) can't hold this crop mechanically, hence the system list above.

Growing media

The substrate the roots sit in. Choice depends on the system (clay pebbles don't fit NFT channels; rockwool isn't used in media beds) and the crop (rocoto works in the media listed below).

Bacterial surface area matters for aquaponics: clay pebbles, lava rock, and pumice double as biofilter substrate. Low-surface media (rockwool, perlite, pea gravel) work in hydroponics but need a separate biofilter in aquaponics.

Nutrient demand by stage

NPK ratios are relative weights at each growth stage; the nutrient mix calculator scales them to absolute grams or ml. EC targets shift through the plant's life: seedlings need a much lighter solution than fruiting adults.

Companion-growing notes

• Heavy uptake of potassium, calcium. Co-grown crops with the same demand will end up deficient even at "correct" EC. Plan around this in shared reservoirs.

Aquaponics suitability

Compatible with typical aquaponics nutrient profiles. Fish waste provides enough nitrogen for healthy growth; supplemental potassium, calcium, and iron may still be needed depending on fish stocking density.

Care notes

Culture is identical to the manzano entry: cool-loving C. pubescens that prefers 15–25°C and performs poorly in the tropical heat that other hot peppers demand. EC 2.0-3.0 mS/cm. pH 5.5-6.5. Moderate light (DLI 14-20 mol/m2/day). Plants are large and perennial. From transplant to fruit: 90-120 days. For rocoto relleno: select large, firm, thick-walled fruits. Cut the top off like a lid, scoop out seeds and membranes (wearing gloves), blanch the hollowed pepper briefly to soften, stuff with filling, replace the lid, and bake at 180°C for 30-40 minutes until the filling is cooked through. The thick walls hold their shape during baking. For Bolivian llajua: grind fresh rocoto with tomato, quilquina herb (or cilantro as a substitute), and salt in a mortar. This fresh salsa is served with virtually every meal in Bolivia.

Further reading

• Getting started with hydroponics: which system to build first
• Understanding nutrient solutions: N-P-K, micronutrients, and why your lettuce turned yellow