🫚 Jerusalem Artichoke

Sowing window (UK)	February to March
Minimum soil temperature	5°C at seed depth
Sowing depth	10 cm
Spacing	90 cm apart
Days to germination	14 days
Days to harvest	270 days
Sowing method	Direct sow outdoors
Frost hardy	Yes
Sun	full-sun
Watering	low
Plant family	Asteraceae

When should I sow Jerusalem Artichoke in the UK?

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

What soil temperature does Jerusalem Artichoke need to germinate?

Jerusalem Artichoke 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 Jerusalem Artichoke?

For Jerusalem Artichoke, sow it 10cm deep and space plants 90cm apart.

How long does Jerusalem Artichoke take to grow?

Jerusalem Artichoke takes roughly 270 days from sowing to harvest. Seed usually germinates in about 14 days.

Is Jerusalem Artichoke frost hardy?

Yes. Jerusalem Artichoke 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.