First...I'm not sure you have a long and warm enough growing season to get any C.selloana to flower, male or female.

Second, the 'Pumila' cultivar, while not totally sterile, produces very few viable seeds from a good female specimen, in ideal conditions. I'm not sure where you can buy guaranteed viable seed.

Finally, your best bet for buying a female plant would be to use a well-reputed source. I can't point you to any such source, but I would talk to places like San Marcos, High Country, Santa Rosa, Kurt Blumel etc., and tell them what you need.

Thanks donn for the information. Since the likelihood of getting any viable seed is pretty slim, I think I'll give up on the idea.

By the way the nursery where I purchased the Pumila grass gave it a hardiness rating of Zone 4, that's what prompted me to try and grow it in my northern garden.