Here is my thought. You probly are getting Mexican mersh and it could be indica or sativa. If it's good and gets you real high and has a furry pod like look to it, it's indica. If it's weak and fluffy with alot of red hair it's sativa. Reason the sativa is weak from Mexico is because they pick crops early there. Since the fields are loaded with males, if they don't pick early, all the bud gets seeded to hell. Indica flowers earlier, so it tends to be more potent even if picked to soon. Growing from a bag of seeds is always a crap shoot because there is no way to tell what you'll end up with.