Gradation in solid masses is going to take some work.
Two things I think I should have done differently. First, the leaf green (sort of blue-green second stripe from the bottom) probably would have gone better on the other side of the moss green silk (top stripe). Second, it might look better with darker colors at the top, paler below.
That said, I do think it came out kind of pretty. The willow-green for the edge does go nicely with all the others. And at least the striping pattern works!