Should I switch to flowering now?

If you limit the time in veg to about 4-5 weeks for the Sativas, and then go to 12/12, and with a bit of training, you Durban Poison should fit ok. Durban Poison, in my experience, tends to grow quite bushy for a Sativa and does not grow as extremely tall as most other Sativas, which if grown in the ground outdoors, can attain heights of 3-4 metres easily, especially if started in early Spring. Growing autos and photoperiod strains at the same time and in the same tent, will cause problems for you. Either your autos will suffer in a 12/12 schedule and your photoperiod plants won't flower in a 18/6 schedule. It is best to do one or the other, especially if you only have one tent/grow space. Hope this helps,.......... Organoman.

I would not if it is a photoperiod yet. Just top it then veg for another 3 to 4 weeks with some lst and you will like the result 10 fold. Good luck and happy growing 🌲🌲🌲👊