🌱 Rosemary

Sowing window (UK)	March to May
Minimum soil temperature	10°C at seed depth
Spacing	60 cm apart
Days to germination	15 days
Days to harvest	365 days
Sowing method	Start under cover, transplant out
Frost hardy	Yes
Sun	full-sun
Watering	low
Plant family	Lamiaceae

When should I sow Rosemary in the UK?

In the UK, sow Rosemary from March to May. 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 - rosemary will sit and rot in cold ground.

What soil temperature does Rosemary need to germinate?

Rosemary 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 Rosemary?

For Rosemary, space plants 60cm apart.

How long does Rosemary take to grow?

Rosemary takes roughly 365 days from sowing to harvest. Seed usually germinates in about 15 days.

Is Rosemary frost hardy?

Yes. Rosemary 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.