My white Clematis was also just newly planted last year and is the smallest of the 3 climbers but it has produced some beautiful white blooms for me this year.
My dark purple clematis moved with me last year. I have had it for many years and it is a real favorite of mine. It has really doubled in size this year and I have no idea why. I have noticed a very large difference in the soil here, as compared to where I lived before. Mind you, this is just up the street from where I lived but for some reason, the garden is exploding into something bigger and better blooming then it ever was before. It is almost like there are steroids in the soil.