What does it mean when leaves do this?

[Delps8]

So I have an ac infinity tent with all the ac infinity gear. The controller tells you what the vpd is. ( I'll add a Pic below)

I got that light meter. It goes with an app on my phone. Idk how much my plant can take. I also don't know what to look for if it's struggling. I'll also add a Pic of the meter.

I will also add a Pic of some leaves that idk what's going on with them.

There's also leaves turning yellow. There very easy to pull off. They almost fall off. I do know that during flower there supposed to right? I'm just about entering the 3rd week of flower

If you can maybe point me in the right direction I'd really appreciate it. Alot of people on here give false info.

I'm new to growing for the most part

I'm new too - 3 years and counting.

I've attached graphic about the things that make up a grow environment. You've covered a few of them but should work through the list to get things working better.

Light - is low. For a plant of that age, cannabis will thrive at double the amount of light that you're giving it. Since you're not using a meter, I have little faith in the readings but it's "run whatcha brung" so to speak so with go with it. The light saturation point for cannabis is considered 800-1000µmol. You grow is well below that and chracteristics of plants that aren't getting much light are that they are tall, with not a lot of branches or laves and have significant space between the nodes. I glanced briefly at your photos and they're not as tall and slender as some, they will benefit when you get your PPFD up. A grow at 1kµmol will yield, roughly, 80% more than a grow at 500 (the relationship is not quite linear) but you're a little behind the power curve so maybe you'll only get 50 or 60% more by turning up the dial. My recommendation would be to go to say, 650 µmol, check your plants and, if they're doing OK (they should be) go to 700 the day after.

A meter will tell you how much light your plants are getting. The plant will tell you how much light is can use and, if you give it too much light, the leaves will "canoe" or "taco" or they'll rotate from horizontal to vertical. They'll start to move in a few minutes so, up the light in the AM, hang out for a while, then go back in the tent every 30 mins for an hour or two. Take pictures at the start and then compare. If there's too much light, they'' let you know.

You may see them start to rise from horizontal toward the vertical - not turning vertical but actually rising up. That's referred to as "praying" and it's considered a good sign.

Leaves dropping - I'm a hydro grower so I don't know soil but, along the way, I've picked up that leaves that have tips that point down can be caused by overwatering or by too much nitrogen. Hopefully a soil grower can chime in but that's where I'd start to look.

Yellow coloration - it could be not enough nutrients but it could also just be that those leaves re dying off ("senescence"). The dark yellow is a sign of a leaf that's ready to drop off by the light green/yellow could be from not enough nutrients. If so, congratulations because "no one" gives their plants too few nutes. Growers tend to slather on the the nutrients thinking that plants will grow better but they don't. That's when you get toxicity.

How about providing info about the rest of the grow environment? Someone here should be able to provide info about nute levels and soil. As a hydro guy, I'm pretty useless re. soil.




[checks out the plant pix again]

Nice manifold. I been meaning to do that but I chickened out!

Re. light levels and leaves - your plant doesn't have "a small number of large leaves" (not enough light) but they're not "compact and bushy" which is what you see when plant has had "lotsa light". More light now=more weed later and also easier to harvest, too, because the branches are closer together.

OK, VPD - VPD is for plants what "feels like" is for humans.

Extremes of temp and humidity are hard for us to survive in because it's hard to keep our body temps in range once we get above, say, 80° and 60% or below 65° and 50% (or so).

Plants have similar limitations.

VPD is one number that represents a range of temp + RH values. Just like "feels like" does.

At 1.3, your VPD is a little high so if you can get a little more moisture in the air, that will get you down to 1.2. Not a big issue but 1.3 is a tad high at this stage.

You cannot set VPD properly without knowing leaf temperature. The AC Infinity software has a place to enter the "leaf temperature offset" which is typically -2°. If you haven't entered a value there - there could be a default value, howewver - your VPD is wrong and that could be a reason why you've got some yellowed/yellowing leaves. "could be".

Don't mean to sound harsh, I hope you don't take it that way. That's a nice looking plant and the manifold looks great. It's great you're spending the time and $$ to measure light, VPD, and RH and temperature. Those a very important factors to nail down and, with a couple of tweaks, you'll have a really good harvest.

First steps - get that light turned up (that's how plants make food) and then get the nutrient issue squared away.

 

[F_T_P!]

Just as the title said....what does this mean?

Seems like the leaves are folding and curling?

I'm kinda still new with growing

Tks ahead of time

To me it looks like Nitrogen toxicity and overwatering.

 

[Jimi O'Connor]

I'm new too - 3 years and counting.

I've attached graphic about the things that make up a grow environment. You've covered a few of them but should work through the list to get things working better.

Light - is low. For a plant of that age, cannabis will thrive at double the amount of light that you're giving it. Since you're not using a meter, I have little faith in the readings but it's "run whatcha brung" so to speak so with go with it. The light saturation point for cannabis is considered 800-1000µmol. You grow is well below that and chracteristics of plants that aren't getting much light are that they are tall, with not a lot of branches or laves and have significant space between the nodes. I glanced briefly at your photos and they're not as tall and slender as some, they will benefit when you get your PPFD up. A grow at 1kµmol will yield, roughly, 80% more than a grow at 500 (the relationship is not quite linear) but you're a little behind the power curve so maybe you'll only get 50 or 60% more by turning up the dial. My recommendation would be to go to say, 650 µmol, check your plants and, if they're doing OK (they should be) go to 700 the day after.

A meter will tell you how much light your plants are getting. The plant will tell you how much light is can use and, if you give it too much light, the leaves will "canoe" or "taco" or they'll rotate from horizontal to vertical. They'll start to move in a few minutes so, up the light in the AM, hang out for a while, then go back in the tent every 30 mins for an hour or two. Take pictures at the start and then compare. If there's too much light, they'' let you know.

You may see them start to rise from horizontal toward the vertical - not turning vertical but actually rising up. That's referred to as "praying" and it's considered a good sign.

Leaves dropping - I'm a hydro grower so I don't know soil but, along the way, I've picked up that leaves that have tips that point down can be caused by overwatering or by too much nitrogen. Hopefully a soil grower can chime in but that's where I'd start to look.

Yellow coloration - it could be not enough nutrients but it could also just be that those leaves re dying off ("senescence"). The dark yellow is a sign of a leaf that's ready to drop off by the light green/yellow could be from not enough nutrients. If so, congratulations because "no one" gives their plants too few nutes. Growers tend to slather on the the nutrients thinking that plants will grow better but they don't. That's when you get toxicity.

How about providing info about the rest of the grow environment? Someone here should be able to provide info about nute levels and soil. As a hydro guy, I'm pretty useless re. soil.

View attachment 5408660


[checks out the plant pix again]

Nice manifold. I been meaning to do that but I chickened out!

Re. light levels and leaves - your plant doesn't have "a small number of large leaves" (not enough light) but they're not "compact and bushy" which is what you see when plant has had "lotsa light". More light now=more weed later and also easier to harvest, too, because the branches are closer together.

OK, VPD - VPD is for plants what "feels like" is for humans.

Extremes of temp and humidity are hard for us to survive in because it's hard to keep our body temps in range once we get above, say, 80° and 60% or below 65° and 50% (or so).

Plants have similar limitations.

VPD is one number that represents a range of temp + RH values. Just like "feels like" does.

At 1.3, your VPD is a little high so if you can get a little more moisture in the air, that will get you down to 1.2. Not a big issue but 1.3 is a tad high at this stage.

You cannot set VPD properly without knowing leaf temperature. The AC Infinity software has a place to enter the "leaf temperature offset" which is typically -2°. If you haven't entered a value there - there could be a default value, howewver - your VPD is wrong and that could be a reason why you've got some yellowed/yellowing leaves. "could be".

Don't mean to sound harsh, I hope you don't take it that way. That's a nice looking plant and the manifold looks great. It's great you're spending the time and $$ to measure light, VPD, and RH and temperature. Those a very important factors to nail down and, with a couple of tweaks, you'll have a really good harvest.

First steps - get that light turned up (that's how plants make food) and then get the nutrient issue squared away.

View attachment 5408659

Yea I got a light meter about a week ago. Since then I have turned up the power on the light.

As far as my grow goes 3x3 ac infinity tent with all the ac infinity gear that came with the tent
like the fans,light, etc etc...

So hum living soil and fox farm mix. Unfortunately I had to mix them together to have enough to fill a 5 gal cloth pot.

The strain is skunk xl



.

 

[Delps8]

So I have an ac infinity tent with all the ac infinity gear. The controller tells you what the vpd is. ( I'll add a Pic below)

I got that light meter. It goes with an app on my phone. Idk how much my plant can take. I also don't know what to look for if it's struggling. I'll also add a Pic of the meter.

I will also add a Pic of some leaves that idk what's going on with them.

There's also leaves turning yellow. There very easy to pull off. They almost fall off. I do know that during flower there supposed to right? I'm just about entering the 3rd week of flower

If you can maybe point me in the right direction I'd really appreciate it. Alot of people on here give false info.

I'm new to growing for the most part

Not sure where you're getting 402 and 570µmol but those are acceptable light levels. To maximize growth and yield, your plants should be able to tolerate 800-1000µmol. That's referred to as "the light saturation point" for cannabis and it just means that cannabis can, in a good grow environment, make use of between 800-1k µmol. There's a range of PPFD's because it's strain dependent.

But the LSP depends on what's going on with the plants and, at the moment, there's an issue. @HydoDan called it - though my knowledge of soil growing is very limited, clawing leaves are generally attributed to overwatering or too much N.

There's no need to square away the clawing issue before you turn up the light level. The meter will indicate about how much light is hitting the plant but only the plant can indicate how much light it can tolerate.

One of the reasons to train plants is so that you have a level canopy and that will help cut down on the vacation in PPFD across the canopy. AC Infinity lights have a hot spot in the middle so you'll want to take that into account as you train your plant.

I've selected the Ionframe EVO4 completely at random so you'll want to check the PPFD map for your particular light. I've looked at a few of their lights and my impression is that they tend to have a similar PPFD map with the highest values in the center, which is common to LED lights, but the PPFD values drop off very quickly when you move from center.

To compensate for that, you can raise the light and turn up the power or allow the colas that are furthest away from the plant to grow taller.

In terms of how much light, you could start by turning up the dimmer so that the area that's getting 570µmol is getting 650. If the plant can't handle that much light the leaves will "canoe" or will turn away from the light. If you don't see any reaction to the increased light level, go from 650 to 750, check the plant for a negative reaction and, if it's all clear, bump it up another 50 or 100µmol.

I would suspect that you're going to get photo-inhibition (reaction to light) after a couple of increases. Your plant is showing symptoms of a problem and that may be impairing the plants' ability to process photons.

Many growers will turn the lights down when they hit a glitch. There's simply no reason to do that and, in fact, it reduces the plants' ability to make food but the grower believes that they've help solved the problem by turning down the light when in fact, by reducing the light level, they have reduced growth and may have introduced another problem.