your girls r not too happy with temps that low, and yes they will flower without sup lighting. put some light bulbs on a timer, on for 5 minutes once every 2 hrs while dark out. here in Michigan I don't put my girls out until mid may. start hardening off may 10th n have them in their pots by may 20th. by then my t5 lights have gradually been turned down a 15-9 light schedule. this has worked well for me. B HAPPY