spiderwort and tulip poplar. Native mining bees and carpenter bees are extremely active too.
This year, I started to checkerboard the honey cap of over-wintered hives on March 6th. Since then, I check the honey cap every three weeks. My version of checkerboarding uses foundation-less frames with no drawn comb. Yesterday, I added another medium box to each hive. I don't know how long this nectar flow will last, but I have monstrously tall hives.
My swarm capture is drawing comb and growing in size too, but at a much slower pace than over-wintered hives.