🥦 Broccoli 'Calabrese'

Sowing window (UK)	March to June
Minimum soil temperature	5°C at seed depth
Sowing depth	1 cm
Spacing	45 cm apart
Days to germination	7 days
Days to harvest	105 days
Sowing method	Start under cover, transplant out
Frost hardy	Yes
Sun	full-sun
Watering	moderate
Plant family	Brassicaceae

When should I sow Broccoli 'Calabrese' in the UK?

In the UK, sow Broccoli 'Calabrese' from March to June. It is normally started under cover and transplanted. Wait until the soil has reached 5°C at seed depth rather than going by the calendar - broccoli will sit and rot in cold ground.

What soil temperature does Broccoli 'Calabrese' need to germinate?

Broccoli 'Calabrese' 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 Broccoli 'Calabrese'?

For Broccoli 'Calabrese', sow it 1cm deep and space plants 45cm apart.

How long does Broccoli 'Calabrese' take to grow?

Broccoli 'Calabrese' takes roughly 105 days from sowing to harvest. Seed usually germinates in about 7 days.

Is Broccoli 'Calabrese' frost hardy?

Yes. Broccoli 'Calabrese' 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.