I harvested most of my lavender in late June. I have two pink lavender plants and about 22 purple lavender plants.
My oldest of the purple lavender plants is still putting out some shoots. Much to my delight I found an albino bloom on it!
I say "delight" and not "surprise" because I have seen nature do this and other funky things many times. It is fun to find it happening in my own yard once in awhile.