i have read but i get 3 different answers
lack of phosphorous- dont know specifics of where it came from,to guess on that one.
cooler temps-yes it has been cooler since i had it but it was that way when i got it dont know the temp it was at b4.
close to flower stems change color-this one has pistils all over it so it was close to flower , and the plant it was taken from went to flower after these were cut off .so it could be any of the 3 im guessing.it is beggining to turn green at the bottom of the stem so i guess it's getting better.