I know your post is old, but I have to say that Malawi would be my suggestion.
It's very easy to grow, they are very strong and can stand some abuse but obviously better to avoid that. They do get very tall, mine are close on 6 feet.
Growing up in Africa, I smoked a lot of weed, Durban poisons, Maritzburg slugs, Swazi "rooibaard" and others...
To date, I have smoked nothing stronger than a Malawi, except once we got a stash from somewhere in the Zambezi valley, never found it ever again - the stuff of legend!