Scorzonera

Quick facts

Category

roots bulbs

Difficulty

intermediate

Days to harvest

120 to 180 days

Harvest type

single harvest then replant

Spacing

10 cm between plants

Environment

Temperature

7–24°C

pH

6 to 7.5

EC (hydroponic)

1 to 1.6 mS/cm

Daily light

14 to 20 mol/m²/day

Climate and zones

USDA zones

3 to 9 (winter low around -40°C or warmer)

Frost tolerance

very hardy (survives deep cold)

Season

cool (spring and fall crops)

Viable growing environments:

• outdoor year-round (in zone)
• outdoor in growing season (annual)

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

Scorzonera works in:

• 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 (scorzonera 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.

Aquaponics suitability

Not recommended for pure aquaponics. Fish waste alone doesn't provide enough of the nutrients this crop demands (typically potassium, calcium, or boron). It can be grown in a hybrid system where the reservoir is supplemented with hydroponic-style nutrients, but expect to dose actively.

Care notes

A deep-rooted crop requiring 30 cm of loose, stone-free growing medium. Media beds or tall containers. EC 1.5-2.5 mS/cm. pH 6.0-7.0. Temperature: 10–22°C (cool-season). Moderate light (DLI 12-18 mol/m2/day). From seed to harvest: 110-130 days (long season). Direct seed; the taproot doesn't survive transplanting. Thin to 8–10 cm spacing. Harvest by loosening the media deeply and pulling carefully; the roots snap easily and the latex makes them slippery. Process immediately: peel with a vegetable peeler (the black skin comes off easily), drop into acidulated water. For roasted scorzonera: toss peeled pieces with olive oil, roast at 200°C until golden and caramelized. The flavor is sweet, earthy, and refined. The root stores for several weeks in damp sand at 1–4°C. For aquaponics growers interested in unusual European root vegetables, scorzonera rewards patience with a unique, delicate flavor.

Further reading

• Best crops for hydroponic beginners
• The Kratky method: grow lettuce with zero electricity