I think the nectar coming in is mainly from blackberry because most of the pollen in the hives is grey. A lot of the cow pastures around my house was abandoned this year so they are just choked full of blackberries as far as you can see. There is also a lot of thistle in the pastures. Each thistle flower has about 10 bees digging in them. Its starting out to be a great year. Now i just need to stop them from swarming before the tallow flow. I put supers on about two weeks ago but they are not putting nectar in them yet. They are storing alot in the brood chamber.