Have I killed this

Ok guys 2 years ago I put a raised rose bed around the trunk of a 20 year old flowering tree.( Soil membrane and bark) last year the leaves were a bit wrinkled bit it did flower. This year no buds no green under the bark and it the branches are grey. Dead or could I save it ?

 

If its doing nothing I would suggest it is probably dead.

I would have thought it was probably dying anyway, I dont think your raised bed would have killed it off that quickly.

 

close up of buds

 

@Jdm
Looks like it might have been a flowering cherry, these can be quite short lived. The lichen growing on it particularly in the last picture indicates that it has been growing slowly for some time. Lichen finds it easier to grow on slow growing parts of trees, so trunks and larger branches rather than new growth.
I wouldn't have run the membrane/ bark right up to the trunk, but stopped 6" to 12" away.
How deep is the raised bed and how far up the trunk did you put the membrane?

 

Raised Was bed was about 12 inches high and covered trunk and some.surface roots the trunk was covered by about the same height

 

Is it worth watering daily for next month to see if by removing the bed and exposure to light air and water it may recover ,?

 

Covering the surface roots and the trunk to that depth won't have done it any favours; but I suspect it was on it's way out anyway.

I doubt it I think last year was a final fling. I would remove the tree and continue the raised bed over that area.