Athosanswered grow question 6 years ago This days it's really hard to tell, since most strains are hybrids of indica and sativa. Pure sativas have thin fingered leaves and indicas have fat, fan like leaves.
A more sure way to tell if your plant is sativa dominant or indica dominant, is how much they stretch during the first few weeks of flower: indicas double their height, sativas triple that height. Also sativa flowers tend to be thin and long, as for indica buds they are fatter with more pronounced calyxes. Hope that helps