There are many different varieties of clematis and colours range from white through to pink, deep reds, blues to purples. There are also yellow varieties too. Several are known as ‘Old Man’s Beard’ because of their distinctive seed-heads.
Clematis tangutica is a very popular variety when people look for a species to grow up trees and other tall shrubs/ plants. Its yellow nodding bells are in abundance from July to Sept (then the seedheads are there for the rest of the year after that).