I'm at the end of week 7 in flower and i noticed that one of my plants needed support because i thought the weight of the buds were bringing it down. After I secured it to a bamboo stake, one of the side bottom branches just bent over and broke off. After looking closer at the piece broken off, i was amazed at how hollow it was...just like bamboo. There was no sign of pests inside or anything...the plant looks totally healthy. what could this be?? why is this plant so hollow?