🥬 Radicchio 'Rossa di Treviso'

Sowing window (UK)	June to July
Minimum soil temperature	5°C at seed depth
Sowing depth	1 cm
Spacing	30 cm apart
Days to germination	7 days
Days to harvest	105 days
Sowing method	Direct sow outdoors
Frost hardy	Yes
Sun	full-sun
Watering	moderate
Plant family	Asteraceae

When should I sow Radicchio 'Rossa di Treviso' in the UK?

In the UK, sow Radicchio 'Rossa di Treviso' from June to July. It is normally sown direct outdoors. Wait until the soil has reached 5°C at seed depth rather than going by the calendar - radicchio will sit and rot in cold ground.

What soil temperature does Radicchio 'Rossa di Treviso' need to germinate?

Radicchio 'Rossa di Treviso' 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 Radicchio 'Rossa di Treviso'?

For Radicchio 'Rossa di Treviso', sow it 1cm deep and space plants 30cm apart.

How long does Radicchio 'Rossa di Treviso' take to grow?

Radicchio 'Rossa di Treviso' takes roughly 105 days from sowing to harvest. Seed usually germinates in about 7 days.

Is Radicchio 'Rossa di Treviso' frost hardy?

Yes. Radicchio 'Rossa di Treviso' 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.