🥬 Tatsoi

Sowing window (UK)	March to September
Minimum soil temperature	5°C at seed depth
Sowing depth	1 cm
Spacing	30 cm apart
Days to germination	5 days
Days to harvest	40 days
Sowing method	Direct sow outdoors
Frost hardy	Yes
Sun	partial-shade
Watering	moderate
Plant family	Brassicaceae

When should I sow Tatsoi in the UK?

In the UK, sow Tatsoi from March to September. It is normally sown direct outdoors. Wait until the soil has reached 5°C at seed depth rather than going by the calendar - tatsoi will sit and rot in cold ground.

What soil temperature does Tatsoi need to germinate?

Tatsoi 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 Tatsoi?

For Tatsoi, sow it 1cm deep and space plants 30cm apart.

How long does Tatsoi take to grow?

Tatsoi takes roughly 40 days from sowing to harvest. Seed usually germinates in about 5 days.

Is Tatsoi frost hardy?

Yes. Tatsoi 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.