I have one vigourous plant and when I look at the preflower it appears to be like a green crab claw is this a male preflower?
Probably... google some images for "male preflower" and see if any match up. If you check out this post in my grow journal, you can see some male preflowers on a plant of mine, look at the base of the node where the node and the fan leaf connect with the main stem, theres little pouches there.. them's boys! It's the 2nd picture in. ~Experimentalist