I went to a friend's house today because he wanted to show me his Durban Poison plants before he harvested. I couldn't believe the size of the colas!! I always thought Durban is considered a mediocre producer. Guess I was wrong!
She was grown in a Hempy Bucket. 4:1 Perlite/Vermiculite mixed medium with a small drain hole drilled 2 inches from the bottom of the 5 gallon bucket. Other than using CO2, that's really all I know.