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I use GH Up but I switched to pH Down from ChemBoys instead of the GH version. It's about the same price, IIRC, but more concentrated.

Interesting. I've seen a huge difference in yield as pot size changes but never seen the numbers on it. Yeh, hydro's very different.

That's the "growing" part but "old" at 52? Hah! And… I'm "Generation Jones" so not quite a Boomer.

Thanks for that info. Besides cannabis, the only thing I've ever grown is old. :-(

Journaling can be very helpful. Excel does the trick for me.

I've never found a "chart" that's based on research. Lots of conventional wisdom, lots anecdotes, and lot of people with making proclamations based on their "years of experience" (common elsewhere but not that common here on RIU) but no data, no research, and, as I learned many decades ago...

Thank you. I appreciate the feedback. Re. 1k — what are your yields like in comparison to estimated yield from the vendor (if you're using seeds)?

Leaves tacoing/canoeing and/or rotating around the petiole (like a Venetian blind). I've also ended up with a cola that was slightly bent at the top. And you may end up with foxtails. The tacoing/canoeing is a result of auxins moving from the illuminated side of the leaf to the shaded side...

Cannabis will thrive at a PPFD of 1000µmol. If you're running at 650±, your crop size could well be reduced by about 33% vs what it would be at 1kmol, all other factors being the same. I created this table based on the data presented in the cited research. I would suggest that you increase...

The recommended values from Spider are a very good starting point. I recommend that you start there. "just get it up to %100 as soon as possible..." - I would only recommend that you do that if you want a large, high quality crop. The previous comment is completely tongue in cheek. If you...

I've been hit with thrips a few times and have come to accept is as a fact of life for my locale. I've found spraying Spinosad to be effective. In the past, I've followed the directions and done multiple applications in which I drenched the plant, spraying the tops and undersides of the...

Perhaps. There are a few "best VA 2000" lights. Can you post the exact model number or, perhaps, a link to a web page? The reason I'm asking is that the lights that have that basic description are quite different.

Perhaps but my hunch is that light levels are well down the list of issues. What is different about this grow than your previous grows? When you wrote "on day 19 " - when did you start counting days? Re. what to do with the light. The underlying issue is that I don't have a PPFD map so...

The manufacturer of your light doesn't provide a crucial piece of information about your light called the "PPFD map" so I can't give a solid answer on light. A good source of info is the manufacturer so you might want to check their website. Based on the values for the FC 4800 here, it looks...

The more info you provide, the easier it is to troubleshoot. Per @MickFoster, the temps for your grow are fairly low. 27° to 30°C will increase growth. Also, the combination of temperature and RH (and wind speed/fans) are the factors that drive how much water a plant gives off. The temp + RH...

That's what happened in the two grows (on another forum)-started out watering poorly and changed how they water but it was too late. :-(

I appreciate your comment. I misread your RH readings (a vision issue) and thought your RH was 76 to 78. " maintaining a decent vpd. " With RH at 70±, your VPD is great. Apologies for the confusion. I think that's the right approach. If a grower can't get a grow to "800 to 1000µmol, strain...

It's clear that there's a nutrient issue but I don't see anything that indicates that there's excess light. When a plan receives excess light, the leaves closest to the light source show the most sever reaction and, as you move away from the light source, the reaction to light levels falls off...

I don't recall the title of the video but, in one of the videos where the guest is a long time grower and his perspective was that they don't get concerned as long as an issue is impacting <20% of the plant. Of course experience ≠ expertise but it was an interesting anecdote. The proprietor...