this is a good way to tell around here at least

sativa - light green with golden or purple hairs, less dense but the leaves and buds are crystally as hell and its sticky (i have some sativa buds right now that stick to your finger when you hold them upside down :rasta: ), i guess sativa is usually referred to as Kush (at least with hindu and purple Kush). sativa usually makes the high relatively euphoric and always gets my head buzzin with crazy thoughts which is what i like.

indica - dark green, big buds which are usually really dense and dank. some strains that are indica are strains with haze in the title... these will sit you down quick and just make you want to sink into a comfy chair and be lazy as hell. even though it doesn't naturally make your mood shift to a better mood (although there are exceptions here too) just the feeling you get from it makes you happy.

ahhhhhhh i love weed