hydrangea anomala subsp. petiolaris winter surprise hardiness

Hi, does anyone grow the above and can they suggest how hardy it might be? I have had this plant for 3-4 years but haven't got the best out of it because it's hard to find any real info about it. Some places claim it's only half hardy and it was suggested from the place I bought it that that was true. It has over wintered in an unheated greenhouse and looked like it sailed through without any leaf drop. I've not seen it available again so I'd rather not kill it but it's not flowered yet and I think it would be happier in the ground, so wondering if anyone had experience with it?

 

I think I’m right in saying that @Angie Jones (nut) has grown this … hopefully she’ll see this post

 

Grows perfectly well in my cold garden a few hundred feet up on the moors outside Sheffield.

 

i don't know that variety, but it does seem to be only half hardy, unlike the usual type of H. petiolaris, which are bone hardy.

 

Thanks everyone. Are we talking about this sub species, I have normal petiolaris which is definitely hardy but this is a sub species that is fully evergreen and stays compact.

This is the one I have
Hydrangea anomala petiolaris Winter Surprise x 3 Litre

 

This was splendid in my last garden but died in the current one. But the soil is really hard where I put it and although there are trees around I think it got too much sun