🌱 Runner Bean 'Scarlet Emperor'

Sowing window (UK)	April to June
Minimum soil temperature	10°C at seed depth
Sowing depth	5 cm
Spacing	30 cm apart
Days to germination	10 days
Days to harvest	70 days
Sowing method	Start under cover, transplant out
Frost hardy	No
Sun	full-sun
Watering	high
Plant family	Fabaceae

When should I sow Runner Bean 'Scarlet Emperor' in the UK?

In the UK, sow Runner Bean 'Scarlet Emperor' from April to June. It is normally started under cover and transplanted. Wait until the soil has reached 10°C at seed depth rather than going by the calendar - runner bean will sit and rot in cold ground.

What soil temperature does Runner Bean 'Scarlet Emperor' need to germinate?

Runner Bean 'Scarlet Emperor' needs a minimum soil temperature of 10°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 Runner Bean 'Scarlet Emperor'?

For Runner Bean 'Scarlet Emperor', sow it 5cm deep and space plants 30cm apart.

How long does Runner Bean 'Scarlet Emperor' take to grow?

Runner Bean 'Scarlet Emperor' takes roughly 70 days from sowing to harvest. Seed usually germinates in about 10 days.

Is Runner Bean 'Scarlet Emperor' frost hardy?

No. Runner Bean 'Scarlet Emperor' is not frost hardy. Do not put it outside until the risk of frost has passed in your area, and be ready to fleece it if a late frost is forecast.

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.