Kush alone is 100% indica, but when you get crosses of it like Purple Kush, Hindu, or Mango Kush, those are usually crosses using Kush.

So it varies a bit, but the pure kush alone, is 100% indica and very powerful.

I've only had it once in my life and I remeber taking 2 hits and being gone out my head for many hours. It's an unforgettable strain, but people around here don't grow it much as it is a very lowe yeilder.