Everyone should be experiencing a nectar flow right now in the lower half of MN.
My Basswood trees in Stillwater area have not flowered yet. I can see they are getting close with some cracks in the flower pod. I can see the yellow flower head. So I think the bloom is imminent.
We did not have Basswood flowers last year. All of the flowers fell off the trees around the state before the flowers opened.
This is a pic from S. Alms from southern MN where the Basswoods have just flowered.