🫚 Kohlrabi 'Purple Vienna'

Sowing window (UK)	March to August
Minimum soil temperature	5°C at seed depth
Sowing depth	1 cm
Spacing	30 cm apart
Days to germination	10 days
Days to harvest	56 days
Sowing method	Direct sow outdoors
Frost hardy	Yes
Sun	full-sun
Watering	moderate
Plant family	Brassicaceae

When should I sow Kohlrabi 'Purple Vienna' in the UK?

In the UK, sow Kohlrabi 'Purple Vienna' 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 - kohlrabi will sit and rot in cold ground.

What soil temperature does Kohlrabi 'Purple Vienna' need to germinate?

Kohlrabi 'Purple Vienna' 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 Kohlrabi 'Purple Vienna'?

For Kohlrabi 'Purple Vienna', sow it 1cm deep and space plants 30cm apart.

How long does Kohlrabi 'Purple Vienna' take to grow?

Kohlrabi 'Purple Vienna' takes roughly 56 days from sowing to harvest. Seed usually germinates in about 10 days.

Is Kohlrabi 'Purple Vienna' frost hardy?

Yes. Kohlrabi 'Purple Vienna' 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.