My Jackmanii clematis is about 7 years old and has become larger and bloomed more vigorously with each year. This year though the flowers look a bit strange. They are not as large, have some have a green leaf coloring running through some of the flowers. The flowers have sort of a "crinkle" look to them too. The leaves look OK. Any one have any ideas as to what's ailing this plant? Could it be too much rain and cool weather?