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I found this pretty little flower growing in Docton Mill Gardens in Devon.  Can anyone identify it please?

Think it's comfrey

Thank you Lucho.  I have now Googled Comfrey and found out that it is the variety "Hidcote Blue".  I will have to send off for some. 

It looks like Comfrey to me

It is growing well in the wild at the moment

We have it in our garden and I think it is a very attractive flower.

There's some very like it growing in a wooded area on my site. It's a lot smaller than wild comfrey.