Only one of the strains available at the real seed company now is a weed strain in the sense of a ganja strain (cultivated for seedless female flowering tops), and that is the Kerala. Most of the others are strains cultivated for charas or hashish either by sieving or hand rubbing. They can give you potent plants too, but they tend to be on the milder side compared to ganja strains or modern intensively bred strains like a Haze or a Skunk. You would have to do a bit more searching with a traditional charas or hash plant strain to find a potent specimen - though in the case of the Lebanese or Mazar-i-Sharif they may be relatively easy to find. Old style hash and charas plants have had more selection for resin than potency, because of they way they are farmed (mixing up all the seeds when they do the hash) so they tend to give a mix of plants - you can expect about half to be 1:1 THC:CBD plants, quarter to be high CBD low THC plants, and a quarter to be the more potent high THC to CBD ratio plants. The same is also true with the Sinai Egyptian plant and the indica chinensis Chinese hemp type plant that was called Golden Triangle Akha, from Northern Laos.