Answer: Most clematis bloom early in the season and then may form buds for a second flush of blooms, or form the occasional bloom, later in the season. To some extent it depends on what kind of clematis you have and how it was pruned earlier this year as to whether or not yours would rebloom this summer.
Clematis usually take several years to become well established and bloom to their full potential. In the beginning they use most of their energy to build a good root system. So the first few years' blooming will not be as heavy as you would see on an established plant. Also, your plant may be a bit ahead of the season if it was overwintered in a greenhouse for instance, or raised in a warmer part of the country. So it might not bloom at exactly the same time as local plants of the same cultivar.
New growth is usually a bit lighter green than the older foliage, but it should not be yellow or striped with yellow and green. Overall, I think what you are seeing is probably normal. Good luck wiht your clematis!
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