Sara from Red Wing took this pic of Yellow Sweet Clover blooming in Red Wing, MN. I saw some Yellow Sweet Clover blooming on Hwy 36 yesterday.
Supers should be on over wintered colonies now. When the package bees from this spring are close to being done with drawing foundation, do a reversal if the top box is not full of honey. If the top box is heavy with honey do not do the reversal.
Put two supers on the package bee hive.
Like Basil Furgala said "you can't make any honey if your supers are in the garage".