Welsh Onion

Allium fistulosum

Welsh onion is a hardy perennial vegetable. Rather than producing large bulbs like its namesake, it produces clumps of hollow, tubular leaves with a delicious onion flavour. 

Contrary to its name, Welsh onion is in fact native to Japan and China. Apparently it is called ‘Welsh onion’ because of the old English word “welisc” or “wælisċ”, which was used to describe anything foreign or non-native. This reflects the historical tendency in English to use “Welsh” to mean “foreign,” not necessarily related to Wales itself. This also suggests that Welsh onion has been on our shores for a long time.

This is an easy plant to grow, providing a productive, low-maintenance alternative to regular onions year after year. Its flowers are edible and can be used to add a decorative and flavourful touch to salads, and are loved by bees and other pollinators. It thrives in full sun and well-drained, loamy soil, and reaches a height of around 30-60cm.

£3.50
Sowing and Growing

Sow indoors in early spring or directly outdoors once the danger of frost has passed. Scatter the seeds on the surface (or carefully place in plug trays), cover with a very thin layer of soil and tamp down. Germination normally starts within 10-14 days.

Species Info
Soil
Height
Recommended Sowing Times
Sunlight
Life Cycle

Perennial

Flowering

May, June

Hardiness

H3 (half-hardy – unheated greenhouse/mild winter)

Flower Colour(s)

White

UK Native

No

RHS Pollinators

Yes

Can be sown direct?

Yes

General Uses

Edible, Edible Flowers, Perennial Veg

Stratification Needed?

Stratification not required

Recommended for Beginners

No

Best for Bees

Yes

Description

Welsh onion is a hardy perennial vegetable. Rather than producing large bulbs like its namesake, it produces clumps of hollow, tubular leaves with a delicious onion flavour. 

Contrary to its name, Welsh onion is in fact native to Japan and China. Apparently it is called ‘Welsh onion’ because of the old English word “welisc” or “wælisċ”, which was used to describe anything foreign or non-native. This reflects the historical tendency in English to use “Welsh” to mean “foreign,” not necessarily related to Wales itself. This also suggests that Welsh onion has been on our shores for a long time.

This is an easy plant to grow, providing a productive, low-maintenance alternative to regular onions year after year. Its flowers are edible and can be used to add a decorative and flavourful touch to salads, and are loved by bees and other pollinators. It thrives in full sun and well-drained, loamy soil, and reaches a height of around 30-60cm.

Additional information

Soil
Height
Recommended Sowing Times
Sunlight
Life Cycle

Perennial

Flowering

May, June

Hardiness

H3 (half-hardy – unheated greenhouse/mild winter)

Flower Colour(s)

White

UK Native

No

RHS Pollinators

Yes

Can be sown direct?

Yes

General Uses

Edible, Edible Flowers, Perennial Veg

Stratification Needed?

Stratification not required

Recommended for Beginners

No

Best for Bees

Yes