Obviously I have not done as much trying and failing as you have Jiggsaw. I clearly haven't done my homework and have been looking at growing weed in all the wrong ways. Forget what I said thedankplatypus, ignore my post, my suggestions are clearly unfounded in comparison to others here. Soil must be the key factor here. I have just learned something new, bad soil makes a plant grow tall and thin... I didn't know that... imagine...

Good luck