It is very invasive, you may be sorry you planted it. I have mine in a pot.

yes it is quite happy outside over winter as my brother can attest too. He wishes it wasn't as it has taken over a rockery. So consider its inclusion with care.

Hi, I have it on my long rockery. Hywel and Eileen are right, plant it with care. I love it and it's spread extremely well!!! However I'm happy with this as a lot struggled on my vertical rockery!
I noticed it struggled a bit last year on my area when we had a long, hot summer. It did bounce back though!

I hope it behaves for you :)

It's not the only deeply invasive little beauty. I have sweet woodruff all over the beds and I loved it. Until I realised that its roots spread like mad under the soil. Took me ages to pull up roots smothering other small plants. .