CC is strictly a once a year bloomer. I’ve never done a serious study of pollen viability at RT or cool or frozen. Very likely it depends on the CV. My problem is that it gets hot here too and nothing takes well on anything above some temp. Maybe that’s my next project if I can get a sucrose borate solution that gives reliable % viability estimation.
Thank you so much, Larry. Mine arrived this morning and, like me, is anxiously awaiting (in the freezer) the first rose blooms here in Indiana!
Theodosia, you might be interested in article #432B-71, “The effects of anthropomorphization on pollen viability of Rosa sp. and selected cultivars.”