wow, that's kind of crazy. I've never heard of someone growing their own poppies for personal use. The reason being that you would have to have a whole field of poppies for it to be worth the effort(IMO). Growing just a few indoors would still take a long time for the poppies to grow to maturity, plus the amount of opioids you get from an indoor grow isn't worth the effort.
But to be completely honest, I've kinda always wanted to grow my own poppies, just for fun... despite the low yield/work ratio.
Sry man, I don't have an answer for you.
EDIT: Actually man, now that I think about it, if you can't find the answer you're looking for on BL, I would try going to a book store or maybe a plant store that has books, and find a book that has information about growing poppy plants. Since there are several different varieties of poppy plants, but they are all somewhat similar in the way they grow(as far as I know), I would think a book with info on growing poppy plants/bugs associated with growing poppies/water levels/temperature/light/and nutrients would have enough information for you to figure out why they are turning yellow and purple and have stopped growing. Although, when I was growing plants of another variety
, yellowing of the leaves usually meant the lights were too close/strong, or that your plant wasn't getting the correct amount/type of nutrients. But when the leaves of my plants were turning purple, that was usually something that I WANTED to happen, given the type of plant I was growing.
