Clematis Omoshiro survived -30C/-22F without winter cover in excellent condition and so far looks like most vigorous clematis among those growing in my garden. Planted in 2008, gave me 3 beautiful flowers last May. No special care, no compost, no fertiliser added since planting. These fat, hairy buds make me always wonder at Nature's richness and diversity.
Clematis Omoshiro - japanese, large-flowered, requires pruning immediately after flowering.