Bob Hobden wrote:

Tip it out of it's pot if you can and check the roots are OK. If they
are then either repot or plant in the ground (where it should be IMO).
If the roots are rotten but the stem is fine then it may regrow roots
if repotted in well drained compost and kept dryish. If the stem is
rotten cut off the rot, treat as a cutting and grow as above.

Thanks, I'll extract it later and see what remains below the surface, I
had intended to move it from container to some beds before now, but the
beds still don't exist yet ...