OK. Lots of Yellow Bottle Bloom talk. I have been playing with this stuff for a while. One thing for sure, this is an extremely powerful additive that can help you or hurt you...depending on when you use it. First off, what does it do? Well, in a nutshell, it forces new bud growth. I have used it before flush, in flush, and in week 5ish. Before the flush it can start new growth right through the existing bud and really fuck up bag appeal. Although new weight is there, it's not worth it. During flush it can add a little weight with no effect on bag appeal.
The best way to use it IMO is right after the plant stops the fapid growth phase around weeks 4-6. Basically, when the pistils are still clear white, but growth has slowed. I have found that Final can promote an additional 10 days of that rapid growth phase. Any foxtailing is incoorporated into the initial bud mass and does not affect bag appeal. It's best described as a "rapid growth extender". I keep pouring it on until the plant has given all it can and the pistils start to dry up. At this point a graduated flush begins.
I know I have promoted using it differently in previous posts. Like any powerful additive is takes testing to identify its best uses. Furthermore, the way different strains react can vary greatly. DO NOT just do what I do. Chances are it won't work as good as if you do some testing on your strain in your room.
I advise having AT LEAST one test going and no more than 3 going all the time. I do testing as a single elimination. I am not looking for some huge result. I am looking for 20 very small improvements over the course of years in the same room. Here's some of my rules for testing:
1. Isolate test plants under their own light if possible. I have a couple 600's used just for testing.
2. Use at least 2 test plants and 2 control plants. I like either 2 on 2 or 3 on 3.
3. Test only one thing. A single variable is an absolute necessity.
4. After a successful test, repeat it with more plants before applying to entire crop. Yes, it takes time. But, it's the prudent path.
5. Have fun. Run only as many tests as you can while still having fun. Currently I'm not running any tests because I'm in the middle of a complete shop renovation. Testing now would consume time I don't have. That's not the attitude I want when testing.
Many folks will see that I've changed many things since starting this op. Part of this is because I had taken some time off growing before setting up this show and many things have changed. Part of this is because every room and every strain is different. Testing is just a part of the growing process. The industry is moving forward as a whole. If you're holding still, you're losing ground. Continued improvement is a necessity to survival. I don't care if you're pulling 1.5 grams/watt of the best OG. If you stop improving, you'll soon be overtaken. We are the R&D in this industry. Any one of us can discover a new method or technique.
Good luck to everyone with thier testing. Please be sure to share what you've learned.