I tried to grow some Clematis with Hydrangea paniculata, the late-blooming panicle hydrangea, (sometimes refered to as ‘Pee Gee’ or ‘Tardiva’.) but this is not successful.
This hydrangea is pruned drastically early spring. When the clematis starts to grow, the branches of the hydrangea are low and bare . There, they intertwine. The hydrangea however, keeps on growing, thus the clematis blooms deep in the shrub and not in front, where it is wanted.
Another lesson learned.