Plants started on 18 6 cycle anyone know how to put them outside without flowering

Hi help out folks

Well I managed to set my timer wrong . Ive started off some orange buds ,some kaya47 and Super Skunk on an 18 hour timer. The plants were supposed to go straight outside but the weathers been a bit crap recently so I put them under lights for the first 4 weeks of their life. However if I put them out now with about 13 hours of daylight here in North Spain Im worried it may stress them and cause them to go either hermie or to flower too soon . Obviously I want them to grow a fair bit more before flowering. What a prick I feel not to put the timer on 13 hours .Is there a way to safely transfer them
outside. Ive heard you can put them in the dark for two days and they will not then flower.

I would wait to take them outside, if you are only getting 13 hours of light. Give it two weeks or even a month until you're seeing at least 14 hours of light.

Yeah 13 is close, I don't think it would start to flower but IMO I woild also wait till 14 hrs of light