Oh nice choice that Clematis 'H.F.Young'
i looked it up and isn't it very similar to the shots of Clematis 'Dorothy Walton',..you will be over the moon when yours blooms,..remember the saying about Clematis,..Blooms in the Sun,..Roots in the Shade,..by coincidence this was brought up last night in my garden thread,..Untitled,..vibes being picked up