🌱 Spring Onion 'White Lisbon'

Sowing window (UK)	March to August
Minimum soil temperature	5°C at seed depth
Sowing depth	1 cm
Spacing	15 cm apart
Days to germination	21 days
Days to harvest	60 days
Sowing method	Direct sow outdoors
Frost hardy	Yes
Sun	full-sun
Watering	moderate
Plant family	Amaryllidaceae

When should I sow Spring Onion 'White Lisbon' in the UK?

In the UK, sow Spring Onion 'White Lisbon' from March to August. It is normally sown direct outdoors. Wait until the soil has reached 5°C at seed depth rather than going by the calendar - spring onion will sit and rot in cold ground.

What soil temperature does Spring Onion 'White Lisbon' need to germinate?

Spring Onion 'White Lisbon' needs a minimum soil temperature of 5°C at seed depth to germinate reliably. Below that, germination is slow and patchy, and seed is more likely to rot than sprout. Measure at around 5cm down, in the morning, rather than trusting air temperature.

How deep and how far apart should I sow Spring Onion 'White Lisbon'?

For Spring Onion 'White Lisbon', sow it 1cm deep and space plants 15cm apart.

How long does Spring Onion 'White Lisbon' take to grow?

Spring Onion 'White Lisbon' takes roughly 60 days from sowing to harvest. Seed usually germinates in about 21 days.

Is Spring Onion 'White Lisbon' frost hardy?

Yes. Spring Onion 'White Lisbon' is frost hardy and will stand through UK frosts, so it can be left out over winter in most of the country.

Sowing data cross-checked against RHS growing guides and UK seed-merchant catalogues. Soil temperatures are the minimum for reliable germination, measured at seed depth.