🌿 Mint 'Spearmint'

Sowing window (UK)	March to May
Minimum soil temperature	10°C at seed depth
Sowing depth	1 cm
Spacing	30 cm apart
Days to germination	12 days
Days to harvest	90 days
Sowing method	Direct sow outdoors
Frost hardy	Yes
Sun	partial-shade
Watering	high
Plant family	Lamiaceae

When should I sow Mint 'Spearmint' in the UK?

In the UK, sow Mint 'Spearmint' from March to May. It is normally sown direct outdoors. Wait until the soil has reached 10°C at seed depth rather than going by the calendar - mint will sit and rot in cold ground.

What soil temperature does Mint 'Spearmint' need to germinate?

Mint 'Spearmint' 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 Mint 'Spearmint'?

For Mint 'Spearmint', sow it 1cm deep and space plants 30cm apart.

How long does Mint 'Spearmint' take to grow?

Mint 'Spearmint' takes roughly 90 days from sowing to harvest. Seed usually germinates in about 12 days.

Is Mint 'Spearmint' frost hardy?

Yes. Mint 'Spearmint' 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.