I think you may have had the root rot.

What did your roots look like?

Another thing, I had a rot problem on some old moms I used to have caused by too much moisture in the rockwool cube that the plants were originally planted in. It sort of rotted a ring right around the stem.

This is why I always tell people to do DIRT mothers... and if there is a rockwool plug still on them, GET IT OFF.
stinkyattic Reviewed by stinkyattic on . Dramatic Problems Hello guys, I had been an overgrow member in the past and got my first and only decent grow. 1 out of 1 ain't bad. But its all bad now. here it goes. I had 4 moms (cut from a good mother plant) of three varietys. Purple Ice, purple Cream and Amethyst(two of this type). Under Deep water culture with airstone bubblers, in 4 inch netpots with a plug of rockwool surrounded by expanded clay pellets, they were all apx 6-9 inches tall and pretty bushy. Grown under a 400w mh about 4 feet above Rating: 5