How to grow scorzenera
Overview
Scorzonera hispanica, commonly known as scorzenera or black salsify, is a root vegetable grown for its long, tapering taproot. The root has a dark brown to black skin and a creamy white, sweet-tasting flesh that is highly regarded in European cuisine. It is a hardy, cool-season crop that stores well and is often used in soups, stews, or roasted dishes.
Varieties
- Scorzonera hispanica — The standard variety available in Australian nurseries, with long, black-skinned roots and sweet white flesh.
Soil Preparation
Scorzenera prefers deep, loose, well-drained soil with a pH of 6.0–7.0. Enrich with well-rotted compost or manure before planting, but avoid fresh manure as it can cause forking. Heavy clay soils should be improved with organic matter and sand to aid drainage and root penetration.
Growing Guide
Sow seed directly into deep, well-prepared soil in full sun, as scorzenera develops a long taproot that dislikes disturbance. Space seeds 5 cm apart in rows 30 cm apart, then thin to 15 cm. Ensure soil is free of stones and deeply cultivated to at least 30 cm to allow straight root growth. Keep soil consistently moist but not waterlogged, especially during early root development. Mulch to retain moisture and suppress weeds.
Sowing
Sow seed directly into the garden 1–2 cm deep, as scorzenera does not transplant well. Germination takes 10–14 days at 15–20°C. Space seeds 5 cm apart, thinning to 15 cm once established. Soak seeds overnight before sowing to improve germination.
Care
Feed with a low-nitrogen fertiliser (e.g., seaweed or potassium-rich feed) once during mid-growth to encourage root development. Remove any flower stalks that appear to keep energy directed to the root. Keep soil consistently moist but not waterlogged, and mulch to suppress weeds.
Companion Planting
Scorzenera grows well alongside carrots, parsnips, and other root vegetables, as they share similar soil and moisture needs. Avoid planting near members of the onion family (e.g., garlic, leeks) as they may compete for nutrients and space. Good companions include lettuce, spinach, and brassicas like cabbage or kale.
Common Pests & Risks
Scorzenera is generally pest-free but may occasionally be affected by root-knot nematodes in sandy soils. Slugs and snails can damage young seedlings; use barriers or organic pellets. Aphids on foliage are rarely a problem and can be washed off. No major diseases are common in Australian gardens.
Harvesting
Harvest roots from mid-winter to early spring, once they reach 2–3 cm in diameter at the crown. Lift carefully with a garden fork to avoid breaking the long taproot, as damaged roots do not store well. Roots can be left in the ground over winter and harvested as needed, but they become tough if left too long into spring.
In the Kitchen
Scorzenera roots are best peeled after cooking, as the skin is tough. They have a sweet, nutty flavour similar to salsify or artichoke. Use in soups, stews, roasted dishes, or as a mash. Store harvested roots in a cool, dark place for up to 2 months.
Troubleshooting
Forked or twisted roots: caused by stones or compacted soil; prepare soil deeply and remove debris. Poor germination: seeds are short-lived; use fresh seed and soak before sowing. Yellow leaves: overwatering or poor drainage; improve soil or reduce watering. Roots too thin: low fertility or overcrowding; thin to 15 cm and feed with low-nitrogen fertiliser. Bolting: caused by heat or stress; remove flower stalks promptly.