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Really nice looking plants! One item - the plant in the back left is getting light stressed. "praying" is a reaction to lotsa light and it happens because the auxins on the leaf surface are not able to handle all of the photons that are hitting it. Typically the leaf elevates slightly above...

All other things being equal, the more light you give a plant, the greater your yield. That's true as long as your plants are able to handle the amount of light you're giving them. In optimal conditions, cannabis will grow at 2000µmol ("micro-moles"). That's a staggering amount of light...

15cm? I'd be hard pressed to run my light at that hang height. Sure you can do it but there are a lot of reasons why I don't. What light are you using and what's your setup like?

I'm pretty sure Bugbee has said at least 4% blue in flower so I suspect that any grow light will have at least that amount. I use Growcraft veg and flower lights and I'm sure it's >=4%. Re the spectrum of the sun - I don't buy into the "it's nature, it's optimal". We have a really good handle...

If you're running CO2 and limited to 1250, I'd wonder what's going on with your grow OR what's going on with your meter. What's your CO2 PPM and how are you measuring PPFD? I'd love to run CO2 but I'm really space-limited. :-(

"full blast" - the more light you give your plant, the greater your yield assuming that light is the constraining factor. That means that the other parts of your grow need to be dress right dress before you can max out your light levels. In the research lab, cannabis will thrive at light...

Nice looking plant - no wasted photons! Thanks for the info re. the bucket and swapping the res.

I run four air stones in my res now and, yeh, it's noisy. I finished a grow in the past few days and it's nice to walk in the garage and no noise. Of course, I don't have much of a reason to go in the garage but… ;-) Re. roots in the pump - I use a mesh net ("pump barrier bag") and that does...

When lights are on, plants transpire, respire, and photosynthesize. When lights are off, plants respire and transpire. Running fans during lights out is arguably even more important than when lights are on. When lights are on, temperatures are higher and that reduces the chances for mold and...

One of the concerns I have with a system that does not use a separate reservoir is that they're small systems. I grow in a res that holds 26 gallons and I grow one plant since it's a 2' x 4' tent. The large volume of nutes allows me to have very long intervals between res changes and it also...

Check out the rest of your grow. VPD in range? Nutrients, wind, etc. My photos will handle up to 1150 or so and I ran my autos at 100-1050. Light varies from strain to strain but, if your grow is squared away, you should be able to get at least 800µmol on your plants.

Good stuff! I grow autos 24/0 and then 20/4, 21/3, etc. Big issue is to get DLI into the 70's and 80's. That'll get you to "back up the truck" yields. Last night I watched Mitch Westmoreland's YoutTune video "Manipulating Environmental Factors to Improve Cannabis Yield with Mitchell...

In terms of yield, spectrum is well down the list. I wouldn't run a flower light (HLG R lights or the old Growcraft flower lights) without adding in some blue (eg. a Rapid LED Royal Blue puck) but light spectrum shapes plants, light quantity drives yield. I'm no fan of Migro lights, the main...

Very nice! Congrats on the grow and, now, on to the harvest, dry, and cure. Have you decided how you want to dry and cure? There are a few different ways to tackle that task and, just a few minutes ago, I put the harvest from my latest grow in a Koolatron dryer. You might want to try this...

The white splotches on the leaves look like thrip damage. Check the underside of the leaves with a loupe. At 40x, you can see light brown colored deposits on the leaves as well as mature thrips. If in doubt, go to 60x and scan the underside very slowly.

"The storage solution simply evaporates? The cap doesn't seal?" - Yup. I put solution in the cap and closed it. A few weeks later, nada. :-(

The majority of the values in the ∆ column run between 1 change per minute and 1 change per three minutes (0.33 changes per minute) so I suspect that somewhere in the middle is good. Good air flow helps ensure that the grow gets an adequate supply of CO2 and it reduces the chances of bud rot...

A few weeks ago, I was being pestered by someone (on another site) about air flow in my 2' x 4' tent. In response, I did a Google search, read through about a dozen links, and captured the information in an Excel document. The attached document was written from the perspective of determining...

I have a Bluelab pH pen but don't use it much since I use a monitor. Given that it unused most of the time, it seemed pointless to store it in storage solution and then refill the cap every few days/every week. My understanding is the reason to not store a pH probe in RO or distilled water is...

Re. which input to increase - you might want to view the videos by Dr. Bruce Bugbee. He states that CO2 is the first input that should be increased because it's the cheapest. Supporting this is the fact that we have observed that the area covered by forests is increasing as CO2 levels have...