Posted: 27/03/2014 at 22:24
lills, have you tried growing your clematis in deep pots for a year before planting? I always do this when buying young clematis and have excellent success rates when I plant them into their final positions. I always prepare a very deep hole and fill with home made compost, before planting the year-old clematis about 4-6 inches deeper than when they were in the pots. Before I started doing this (many years ago) I lost a lot of plants in the first year, mainly because many of the well-known suppliers do send plants which are too small to successfully plant out. This is the sort of thing I use:
Edit: note that the better suppliers tend to send you plants in this size pot. More expensive but far more likely to thrive, so well worth the extra.