I can't even find extrema or hercules on their site, and I'm a customer. The mad scientist is going to need a LOT of room by itself due its' herijuana genetics. The shit grows like a Christmas tree, and if it even smells another plant too close it will stretch to the moon. Actually, I'm pretty pissed off right now w/Sannie's indica gear. I'll be lucky to pull an ounce from their herijuana on a 3 foot indoor. And I'm not the only one with this complaint, high potency yes...but a waste of time growing indoors.
Applying this knowledge outdoors, I would recommend at least 5 feet spacing upon planting...and no other vegetation within 5 feet of any of this mad scientist.