Chelle, I think now is a great time to sow Osteos for you. Osteos can handle some low temps, but I would protect them from frost. I would germinate them at warm temps, let them grow for about 2 weeks with room temp and then move them cool when they form their true sets of leaves. So 1 - 2 weeks germination, 1-3 weeks grow room temp and then 2-3 weeks at cooler temps to form flower buds. Cool temp is around 60ºF
