When to turn to flowering?

Judging by the appearance, namely its sizes and sizes of your boxing, it is already necessary to translate to 12/12, because it will still grow on flowering and will be very large. I recommend that now it is translated to avoid problems with excessive growth. And the second point - it seems to me that the plant does not understand fertilizers. Now it is good to give the plant fertilizers in the range of 600-700 PPM. Judging by the size of the bush - there is enough light and it grows well. But judging by the yellow state of the leaves - I think she is not enough for fertilizers. Adjust the number of fertilizers, keep it at the level and no less, and add + 50 PPM every week. Regarding training such as LST topping. Of course, you can still do a lot, for example, you can still expand your plant a little bit of the branches to the sides, in which case you can still wait with flowering for 1-2 weeks and switch to flowering mode after the LST and how all the branches will rest from stress and go up. On the other hand, I see like a well -filled box of boxing. If you want even more a crop, even more plant = do another LST and stretch the branches to the side and then go into flowering mode-in this case, the time to the crop to increase for the time of these training + 1-2-3 weeks. Or start now immediately by switching to 12/12 without additional training, because the space is already filled with good Good harvest 🙌

I personally would not top again. Rather go into 12/12 flower. I prefer my plants on the greener side, but to each their own, and what works for you. Just remember, once you turn to the flower nutrient schedule it will be less N, the plant may turn yellow prematurely.

Actually, she,ll go very easy due to lack of N

Sie benötigt Nährstoffe, würde sie nicht in die Blüte schicken bevor du die Probleme nicht gelöst hast…

3 options -24h of darkness before flip then 12/12 (13-17 days) -24h then 6/18 with DLI 70 (8-10 days, no stretching) -just 12/12 (14-18) Don,t do 2nd option if u can,t measure and calculate DLI

Dipende, secondo me quando riesci a riempire in orizzontale tutta, o quasi, la superficie della growbox...almeno finchè l'altezza te lo consenta...ottimo lavoro comunque!

Looking great for ~5–6 weeks of veg 👍 Since Purple Haze is very sativa-dominant, you can expect around 80–100% stretch during the first weeks of flower. I wouldn’t top her again now to avoid unnecessary stress – she’s already nice and bushy. Since LST is off the table, the best move is to flip to 12/12 as soon as you’re comfortable with the height. Better to switch a bit earlier, the stretch will quickly fill the space. 🌱💜 Good grow!