Like many things in life,,,,,,,,,,,,,,it depends.

The first time we planted BW on my daughters land in NY it went largely untouched for quite a while and ended up flowering for quite a while (it was new to them). However once they tried it and decided they liked it, it got hammered pretty good and in subsequent years they started eating it before flowering. Depending on where you are you may find they start using it as other stuff becomes less avaiable late in summer.