Well, seems that you do everything ok, so maybe by mistake you counted it wrong and simply your flowers still didn't grow to full 3rd stage 100 times. Remember, it counts only in case of 3rd stage of growth.
I had the same - with something about 20 flower pots. It took me twice as long as it should, just because I was impatient and every time used to say "Whaaat the hell, it should have been already done!"