For the most pure Indica I would go with Afghani from Sensi Seeds, and for the most pure sativa I would go with Traveling Thai from Nirvana or Nevilles Haze from green house.
Here are a few strains I would say would be nice. Pretty sure these are either 100 percent or 99. Nagno Gold and Also maybe the most original Northern lights you could find, both indica. Im not much of a sativa guy but, I think Ak-47 is pure sativa.
oh and so is NL so disregard that post by saladank cuz he doesnt know what the fuck hes talking about.....there arent all that many pure strains but id recommend kali mist for a sativa and chocolate chunk is a pure indica. Do some research man, any good seed bank provides the info
This dude is right. You gotta research it, because companys can rename there products how ever they want. So you gotta research it, its going to be very hard though to find pure stains, but good luck. And if you do ill take a clone .... (JK JK JK JK for all those who are going to bug out on me since there the internet police. It says so in there sig. so they must have jurisdiction.)
Afghan is one of the most potent easy to grow pure indica's available, as for pure sativa Durban Poison is very simple to grow and has a good high, I would prefer Haze because the high is truly superior to anything I have ever smoked by far. But that depends on if you have the patience and knowhow to grow it as it is not for beginers also takes 14 to 18 weeks of flowering to mature. But if you have the patience and the knowhow haze will get you higher than you ever thought possible.
hell yeah there are still 100% pure strains out there... just gotta look around; not that hard either... off the top of my head, i would look to seedman's seeds for the indicas and world of seeds (landrace) for the sativas.... but like others have said above; most of the larger seed companies advertise that information.