I have been trying to find some information on collecting seeds from the prickly pear. How long after the flower falls off it the fruit ready. Mine are still green and the seeds inside are tiny and white. I looked up some photos of the seeds on the internet and they were black so im assuming mine were not ready yet. Also most of the fruits they show are red. Mine have the yellow flowers. Will the fruit turn a different color when they are ready to be picked. Also what is the best way to germinate them and how long do they take to sprout? Thanks so much in advance.