Originary from Hindu Kush, a region between Afghanistan and Pakistan
Kush is to Indica varieties what Haze means to Sativa. Much like skunk, kush is a term which can be used to describe a whole lineage of cannabis plants. We use the term Indica today to describe a type of plant which is found naturally (indigenous to) in the India Region. At that time all plants were called Cannabis Sativa, but there was something very different about these varieties which required discrimination into another category, named Indica due to the region where they were first discovered.
Although we now know that Indicas are indigenous to more countries than just India, not only has the term remained, but the pattern of naming weeds after the locations of their discovery has remained also. The first ever Kush weeds that appeared were named in homage to the Hindu Kush, a mountain region which stretches across from Afghanistan into Pakistan.