A new perennial flower in the garden

Apparently I have bought and planted these. There is five of them, now blooming. Not a slightest idea what plant this is!

I made two short walks outdoors today. My knee is bending already so that it could be possible to ride a bike, but I do not dare yet.

I will meet a physiotherapist next monday and have new ideas for rehabilitation of knee replacement. 

Still extremely warm weather .