My bees have been ignoring white clover this year, but the year of the big drought were all over it. Luckily, most of my neighbors have plenty of it in the lawns. That means the bees have plenty to work. I've seen a few recently, but on my lawn they are not my bees -- very light in color, mine are nearly black.
You can tell when they are working it because the pollen is very dark brown. Blackberries are in bloom here, at least my domestic ones anyway, and that pollen is gray.
Peter