I have a conundrum, in that I only have about a 4x2 area of full sun, and a 10x4 area under a medium-sized tree that's probably close to full shade, and about a 20x10 area under a couple large trees that's definitely full shade. My DW's criteria for a flower garden is that it has to look nice out there, but at the same time, give as much bang for our buck as possible in the cut flowers department.

So can you suggest a group of flowers that would fit in the aforementioned areas, look nice together both in the ground and in arrangements, and work in my zone (5)? Thanks for your help.