stunted during flowering

[kb3159]

Ok i am growing 10 plants in a flood and drain. p.h. 6, dutch master nutes, temp max 85. 2 of the plants have seemed to stop growing and producing bud. One was the first to show sex. The plant has been through A-LOT. Before i really started to grow i planted that one seed in some ivy, when it had a couple of leaves the wife told me to get rid of it. just for fun i put it in a glass of water and instead of dying it grew a couple of roots. I put it in rockwool, veged for a week or two then moved it to flower where it has done good till now. Any ideas?
pics at the bottom of link
http://www.marijuanapassion.com/forum/showthread.php?t=12768

 

[kb3159]

Alright most of my plants are thriving. But the one has been in flower for over 5 weeks and still only has a couple of pre-flowers. I think im going to call it a loss, chop er down, and give my other plants a little more room. What do you guys think?