First of all, what is foxtailing? Foxtailing is a term used to describe the deformed appearance of cannabis plants. Here, the buds elongate uncontrollably and take an irregular shape. This strange phenomenon affects cannabis plants in their flowering phases. Foxtails can be pretty alarming to novice growers. As they get confused about whether or not the occurrence is good or bad, Normal cannabis buds have regular shapes with dense buds, while foxtail buds have longer and slender shapes with less dense or wispy buds.