You do have both a male and female vine, yes? Males can be cut back immediately after flowering in spring; females in fall or late winter/early spring but only by about 1/3. I wouldn't be eager about a lot of fertilization - first, it is not intended for the purpose of producing flowers and fruit, and second, kiwis are fertilizer-sensitive and easily damaged by much.

Since kiwis flower and produce fruit on new growth, you should be seeing some signs of reproduction :-)) Cold weather?

Thank you, gardengal. We do have male and female plants. In fact, our kiwi have produced bumper crops for many years, with little care from us. Our winter this year was pretty mild. Also, the flowers and fruit generally come on pretty late. We typically are trying to beat the first frost when we harvest. We live in the PNW and our yard where the kiwi is planted is heavily shaded.

I appreciate your answer about fertilizing. I really wasn't eager to do that, since they already are nearly impossible to contain since they grow so fast.