Welsh onion

Allium fistulosum

The Welsh onion (Allium fistulosum), also bunching or spring onion, forms no large bulb but tender tubular leaves and white shanks. It is hardy, perennial and grows in soil, coco and hydro.

Actualizado:

Important notes

all parts: As an allium, toxic to cats and dogs — it damages red blood cells. Keep away from pets. ↗

Luz

Bright, 12–14 h of light.

Riego

Keep evenly moist; won't tolerate constant wet (bulb rot).

Temperatura

Cool to moderately warm: 15–24 °C. Very frost-hardy.

Humedad

50–65 %.

Valores objetivo por método y fase

Hydro
Fase pH EC (mS/cm) Agua °C Aire °C Humedad % Luz h Duración (días)
Germinación 6–6.5 0.6–1 16–22 16–22 60–70 14 10
Plántula 6–6.5 1–1.4 16–20 15–22 55–65 14 28
Vegetativo 6–6.8 1.4–2 16–20 15–24 50–65 14 45
Cosecha 6–6.8 1.2–1.8 16–20 15–24 50–65 13 45
Tierra
Fase pH EC (mS/cm) Agua °C Aire °C Humedad % Luz h Duración (días)
Germinación 6.3–6.8 0.6–1 — 16–22 60–70 14 10
Plántula 6.3–6.8 1–1.4 — 15–22 55–65 14 28
Vegetativo 6.3–7.1 1.4–2 — 15–24 50–65 14 45
Cosecha 6.3–7.1 1.2–1.8 — 15–24 50–65 13 45
Coco
Fase pH EC (mS/cm) Agua °C Aire °C Humedad % Luz h Duración (días)
Germinación 6–6.5 0.6–1 16–22 16–22 60–70 14 10
Plántula 6–6.5 1–1.4 16–20 15–22 55–65 14 28
Vegetativo 6–6.8 1.4–2 16–20 15–24 50–65 14 45
Cosecha 6–6.8 1.2–1.8 16–20 15–24 50–65 13 45

Problemas comunes

Bulb rot and Pythium from waterlogging, thrips, onion fly, downy mildew.

Pests & diseases

Pest / Disease Symptom Organic treatment
Onion fly wilting yellow stalks, maggots at the base insect mesh
Downy mildew pale patches, grey mould spacing, airflow

Edible parts

  • Leaves · edible from Vegetativo — whole stalk edible
  • Flowers · edible from Floración

Técnicas de rendimiento

Harvest whole shanks or cut the tubes above the white shank — they regrow. Clumps can be divided and replanted.

Propagation & pollination

Method
division
Germination time
12 days
Germination temp
15-20 °C
Sowing depth
1 cm
Pollination
insect
Hand pollination needed
no

divide perennial clumps or sow

Companion planting

🟢 Good neighbours: Garden strawberry

Flavor

mild oniony, fresh

Storage

In the fridge, root ends in a little water.

History

The Welsh (bunching) onion comes from East Asia, where it is a staple; it forms slender stalks rather than a big bulb.

Nutrition

Provides vitamins A, C and K.

Sources

Florabase

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