13 hours of daylight is on the egde. If that's sunrise to sunset, then you're really only getting about 10-11 hours of good sunlight, they will probably go into flower as very small plants, or they'll flower/reveg as the days grow longer. The first and last hour of sunlight don't provide much usable light. My outdoor plants start to go into flower in August when there's about 14 hours on sunlight.