powerstout, bluestreak, and masterlow are all lowryder based strains. the only issue, is that they were all put out by a guy who called himself MDanzig, who cranked out seeds out of a small growroom somewhere in the U.S. he just got busted about 2-3 months ago, and his plants, all his work was taken away. you might still find some powerstout or something at a seedbank, but it's unlikely, and the're probobly jacking up the prices since they know they wont be getting any more of those seeds.
just stick the the jointdoctor's lowryder #2. the original i must admit really sucks - it tastes bad and you'll be lucky to get half an ounce. it usually grows only about 10-12" and all in one cola, no branching, but the #2 is greatly improved - my freind just harvested one and it's great!. it branches quite a bit, grows a bit taller, tastes better, is alot more potent, more uniform, and the yield is 2-3x the size of the original. and it still stays very compact. it's an interesting plant - it's the only one in my life that i've seen form buds near the base where light doesnt really even hit it.
and stay the hell away from miracle-gro, unless you're growing for quantity not quality and want borderline-toxic bud. feeding a plant a diet of miraclegro is like feeding a human a diet of pure sugar and amphetamines. if you stop feeding a m-g addicted plant, it'll stop growing. you're also likely to burn the roots, and after a while salt will start to build up and kill the plant.
going completely organic (like guano, blood/bone meal) is OK outdoors but i would warn against it in most cases. it's unsanitary, and the nutrients take a while to be released. you only have to apply once in a while, but the weed never turns out as good. for good weed you need to flush the plants the last 2 weeks - get them on a "starvation diet" of just distilled water and h2o2. this will make the plant use up it's existing, built up reserves of nutes. the bottom leaves may yellow, but thats a good sign. overferted or unflushed weed tastes bad or chemically, smells "too strong", never dries right (or if it does, crumples into powder), is very harsh on the lungs and can potentially give you a headache, and with longterm use, cancer.
if you're going to use organic nutes, go with O.M.R.I-listed LIQUID nutrients. canna, technoflora, bionova, advanced nutrients all make good products. foxfarm is o.K for beginners but is missing some ingredients. as a rule of thumb, if they sell it at a hardware store, dont use it.
