Clematis query

I shall leave Guernsey Cream to her own devices and hope her buds don't get frosted like last year. I've managed to kill her brother living next door. No sign of life from Ernest Markham, it withered and died during late summer. I've left the place untouched just in  case it revives.

I think they are tricky things. Light prune to tidy up after flowering and then job done for me - I also had 2 of the same variety in group 2,one has lived the other faded away.  but I have had more clematis die on me than any other plant, they just don't thrive for me. 

Most of mine are in group 3 I've found them to be a easier to grow.