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Those are some nice looking plants.

Rinse the sulfur off and spray with sodium bicarbonate. You can add a little olive oil (or any vegetable oil), and maybe a bit of dish soap (I use safer's insecticidal soap, but it has a bit of a smell too), or you can get something like Green Cure. Took care of my powdery mildew, and I'm using...

Yeah, they can. To be honest I really only see one leaf on there that looks like nitrogen clawing. And your leaves would be way darker than that before it would happen. You've got some good tight internodes there, so light isn't your problem, and light is the only thing I can think of that would...

I agree on the cal mag, but why would you flush? edit:I just noticed you mention ph, but in soil, watered with rain water I doubt that would be the issue

If anything it looks like it may be low on nitrogen, those are some pale leaves. I don't see any burnt tips either. I'm no expert on how soil behaves when re-used, but I would give her some nutes, 1/4 to 1/8 strength. See if she improves.

Where on the plant were those leaves from? Were the two on the left of the pic near the bottom of the canopy? My first thought on the other two would be insects, but you said indoors.

I've been using the promix herb & vegetable mix for years. I usually get a month to 6 weeks before I have to feed. And usually by then it's time to pot up. It can be a little hot for sativa dominant plants, you'll get a bit of nitrogen excess, but mine grew through it, just had dark green...

I just checked the price on the one @TacoMac posted. That one would come to $830 Canadian, before customs. All of them are too expensive for me. I would build one myself.

The pop up would eliminate any worry of too much heat or trapping humidity during the summer, you could just put it up in the fall. If you want something sturdy and more permanent, Vesey's seeds sells one with polycarbonate panels. They're based in PEI too, so no customs charges to deal with...

You said above that the trichs look about ready and you're just waiting because you want to flush, right? I don't flush, and I honestly can't tell the difference between flushed and unflushed weed. Check the trichs again and if the balance between clear, cloudy and amber is where you want it...

@Nutty sKunK just mentioned it. You pierce the medium with a bamboo skewer to loosen it up, aerate it. It helps prevent the water from making channels through the medium, gives you more of an even absorption. It can also help by breaking up the root ball a bit causing lots of little roots to...

As long as the buds themselves aren't affected, you shouldn't need to worry. If you've got plenty of light and penetration, that's not the issue, but your plant cannibalizing the leaf, especially late in flower shouldn't really worry you. If a bunch of them show up suddenly, then I would worry.

I used hotrodharley's method too. Really helps rootbound plants. I noticed you said there was clay in your soil. Clay is really high in nutrients, but they're hard for the plant to access because of the clay's structure. If you're going to use clay soil you'll want to add mycorrhizae, the little...

Another method is to slowly drip water onto the soil over the seed with a teaspoon. I also use it as a way to water seedlings, putting a teaspoon full of water right by the spot where it breaks the soil. It's time consuming, but if you like to really baby your seeds and seedlings its hard to...

UVC is really bad for living things. Even plants. That's why it's used for disinfecting. You'd probably be better off with a reptile light if you want uv. Even UVB can cause cellular damage, it's a stressor which causes your plants to produce more trichs. That sounds good, bud dose determines...

Plants have valves in the channels that transport the xylem and phloem iirc. Like the valves we have in our veins (but not arteries). I do know that in the old old days they would always put logs that were cut as pillars upside down if they were going straight in or on the earth, otherwise the...

Thank you. This is exactly the kind of stuff I look for.

Thanks, but I've read that before. That still leaves the question of why dried and cured buds are still green, not brown. There must still be plenty of chlorophyll there, right?

Sorry couldn't resist. It looks like some of the leaves on the inside of my plant that are being cannibalized because of lack of light. The other pics look like a P issue to me.

A dead leaf.