My Green Cracks also grew mostly problem-free in week 4. I might have started fertilizing with Bio Grow a bit earlier, as a very slight deficiency was already noticeable in the larger plants. Maybe I'll add some in week 3 next time.
The small 9th plant is being fertilized with Hesi, mineral. It's quite difficult to keep this plant above water, as the pot volume is so tiny. That's why I've switched to mineral fertilization for this plant.
Overall, the growth is very strong and bushy for all plants. The training is showing good results and has worked well, except for one small thing. Unfortunately, one shoot tore when bending it down, but it should recover.
Regarding my values, I keep a VPD of 1.0 during the day and have set my lights to 500 PPFD.
I also used Boomboomspray again after the training to reduce the stress of the training a bit more and to quickly compensate for the slight deficiency.
My conclusion is positive again regarding the course of the week. There has been a lot of volume, and the plants have developed a nice, strong, and even growth structure. I suspect that the first plants will start flowering by the end of next week. Currently, I'm trying to keep them as short as possible in height, but there's slowly no more room for that.
Hempcules
