It isn't foxtailing. It is much like was said...like the little nubb that grows on an ear of corn late in the season. I have it only with the mostly sativa Matanuska Thunderf**k. I have grown this same strain for 30+ years under 1000W MH and HPS. Mine is never burnt or bleached and is unlike any other growth I've seen in my experience. I haven't noticed it yet but things aren't finished yet due to the long flowering period they seem to have. I don't have any photos currently, but they seem a little different than the one in the picture, which seems like a stretched flower/bud tip..the growth I'm describing is as bald as I am.