Yes, you should be able to have real fun. As an aside some cultivars and volunteers of greggii and microphylla have survived for me in temperatures that went several degrees below zero F. for short periods and routinely survive the low single digits. As you point out winter moisture can be more of an issue if drainage is bad. It is my impression that folks in PNW have better luck with microphylla than greggii. Here in my NJ gardens these species will even rebloom again after a light freeze like 28 degrees that often occurs just before first light. In a remarkable fall 2015 the last microphylla flowers actually lasted into the New Year.
