Clematis: I need advice please, 0 by ClematisGuru

ClematisGuru wrote:
multi blue will open bluer earlier in the season and in relation ,too, to sunlight. i am not aware of anything to alter color except sunlight and time of year and age of bloom,which changes as the bloom matures on the vine. if anyone knows of anything else would love to know about it. here is a multi blue in june, after the plant has been blooming for 6 weeks in zone 5 b. it is growing with a countess bouchard, which has now started blooming.