🌿 Good King Henry

Sowing window (UK)	March to April
Minimum soil temperature	5°C at seed depth
Sowing depth	1 cm
Spacing	45 cm apart
Days to germination	21 days
Days to harvest	90 days
Sowing method	Direct sow outdoors
Frost hardy	Yes
Sun	partial-shade
Watering	moderate
Plant family	Amaranthaceae

When should I sow Good King Henry in the UK?

In the UK, sow Good King Henry from March to April. It is normally sown direct outdoors. Wait until the soil has reached 5°C at seed depth rather than going by the calendar - good king henry will sit and rot in cold ground.

What soil temperature does Good King Henry need to germinate?

Good King Henry 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 Good King Henry?

For Good King Henry, sow it 1cm deep and space plants 45cm apart.

How long does Good King Henry take to grow?

Good King Henry takes roughly 90 days from sowing to harvest. Seed usually germinates in about 21 days.

Is Good King Henry frost hardy?

Yes. Good King Henry 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.