Clematis are happiest when their roots are kept cool and moist, so try to plant them where that the base of the plants will be lightly shaded by other,  lower-growing species. Otherwise, use a clematis root protector, or top-dress  the rootball (avoiding the immediate crown), with a generous layer of shingle   or pebbles. 
 This clematis is herbaceous and will die back during the winter - remove spent  stems and foliage to the ground in February, and apply a thick layer of mulch  to suppress weeds, feed the soil, and keep the root area moist and cool for the  growing season ahead.
 Use twiggy prunings, ring stakes or bamboo canes to provide support.