Kalyseeds specializes in unusual hybrids between cannabis and Japanese hops. After years of experiments the first crossings of the new, so-called PAC-strains, are now available.

The Jap.hop is a hybrid from 1998, between Purple Star and japanese Hop. He has long grown faint-vigorous and stunted, in 2008 it was back to normal in growth. This hybrid is the ancestor of all PAC strains.