Not sure what’s going on here

[BNiceee]

I’m a bit new to growing worked around it have a general idea I started growing few of my own plants am curious if this is the light burning them or if they are just turning the hairs orange

I’m on day 25 of flower

 

[Appalachian]

Do you know your ph level? The leaves are looking just a touch yellow which is either too much water or not enough potassium or not enough water.

 

[RoadKillSkunkHunt]

Do you know your ph level? The leaves are looking just a touch yellow which is either too much water or not enough potassium or not enough water.

Potassium needs are at their highest right now for the OP's budding plants. At about the 3rd week of 12/12 I start using a potassium sulfate finisher.

@BNiceee As for light burn? I'm not sure by the pictures. However, turning the lights down a bit while you're working through issues is a good practice. It slows the plant down enough to help you work through deficiencies, However in your case, your plants look fine to me. Boost potassium because your plants are using a lot of it right now.

 

[BNiceee]

Do you know your ph level? The leaves are looking just a touch yellow which is either too much water or not enough potassium or not enough water.

My ph did get messed up went high for a day to 6.1 been running 5.7 ph normally

 

[BNiceee]

Potassium needs are at their highest right now for the OP's budding plants. At about the 3rd week of 12/12 I start using a potassium sulfate finisher.

@BNiceee As for light burn? I'm not sure by the pictures. However, turning the lights down a bit while you're working through issues is a good practice. It slows the plant down enough to help you work through deficiencies, However in your case, your plants look fine to me. Boost potassium because your plants are using a lot of it right now.

Thank you I appreciate it man I’m using heavy 16 line up I’m using finish for potassium should I possibly try to use a bit more

 

[RoadKillSkunkHunt]

Thank you I appreciate it man I’m using heavy 16 line up I’m using finish for potassium should I possibly try to use a bit more

Only use what the bottle says. You can use less than what they suggest but don't use more. Your plants are not showing huge issues. You're boosting K a bit because the plants are using more at this stage of their stage of growth. You should also be using cal-mag to supplement the growth stage as well.

 

[Florida_Mike]

My ph did get messed up went high for a day to 6.1 been running 5.7 ph normally

What medium are you growing in? Why 5.7?

5.6 is the rock bottom you want to run in hydro.
I grow in rockwool with recirculating drip and run
5.8-62 during veg and 5.9-6.3 during flower.
Coco is a little higher & soil is higher still. (soil
however rarely need any ph adjustments, as
microbes buffer & stabilize ph for you)

I believe in letting ph drift in those ranges rather
than trying to chase around and maintain a
particular fixed number. Better for the plants...
and one's sanity

edit to add: calcium, magnesium and phosphorus
absorption all fall off at lower ph levels. This is the
reason for higher ph during flower. Chart is
for hydro

 

[BNiceee]

What medium are you growing in? Why 5.7?

5.6 is the rock bottom you want to run in hydro.
I grow in rockwool with recirculating drip and run
5.8-62 during veg and 5.9-6.3 during flower.
Coco is a little higher & soil is higher still. (soil
however rarely need any ph adjustments, as
microbes buffer & stabilize ph for you)

I believe in letting ph drift in those ranges rather
than trying to chase around and maintain a
particular fixed number. Better for the plants...
and one's sanity

edit to add: calcium, magnesium and phosphorus
absorption all fall off at lower ph levels. This is the
reason for higher ph during flower. Chart is
for hydro

I work for commercial grow and my buddy who runs tanks told me to use 5.7 till pretty late he said then raise to about 6.1 but it doesn’t seem to be too happy I’ve been running a bit higher at 5.9 recently and still am having some weird symptoms

I am using calmag aswell

I’ve been feeding calmag once a week

 

[RoadKillSkunkHunt]

I've been looking through your thread. Did you ever say what you're growing in? Your buddy running the tanks gave you 5.7 pH and although that is low, it is in parameter for COCO. Are you growing in coco or soil? That bright orange color on the tip looks more like burn not deficiency.

 

[BNiceee]

I've been looking through your thread. Did you ever say what you're growing in? Your buddy running the tanks gave you 5.7 pH and although that is low, it is in parameter for COCO. Are you growing in coco or soil? That bright orange color on the tip looks more like burn not deficiency.

I’m currently running coco Mother Earth would my tops be burning if that was the case ?

 

[Florida_Mike]

It' looks like classic Magnesium deficiency to me. Look at the rust color between the veins (necrosis). In coco you should be giving calmag every watering, not just once per week. Prolly too late to worry much about it much now. And remember; nutes go to roots, not on leaves. Foiler feeding does little more than burn the leaves, imo

https://www.growweedeasy.com/cannabis-plant-problems/magnesium-deficiency -

Growers using Coco Coir or Reverse Osmosis (RO) water usually need to supplement their plants with extra Calcium & Magnesium in addition to regular nutrients. Treating coco coir with Cal-Mag and supplying extra throughout your grow is recommended for growers in coco coir, or those using RO water.

 

[RoadKillSkunkHunt]

I’m currently running coco Mother Earth would my tops be burning if that was the case ?

No, but since you're running coco, you will need to add cal-mag every watering from here on out.

 

[BNiceee]

No, but since you're running coco, you will need to add cal-mag every watering from here on out.

Thank you very much man I didn’t know that was the case I have 18 days till my 8 week of flower do I start flushing or still feed nutes I don’t have a r/o system yet but was thinking about grabbing one is that necessary ? I’ve also heard to start flushing 14 days before harvest

 

[Florida_Mike]

Thank you very much man I didn’t know that was the case I have 18 days till my 8 week of flower do I start flushing or still feed nutes I don’t have a r/o system yet but was thinking about grabbing one is that necessary ? I’ve also heard to start flushing 14 days before harvest

Personally, I feed right up until I chop. Opinions vary widely on this. I don't think the loss in bulk is worth it. Remember, the last two weeks is when they pack on the most weight; why would you deprive them of food when they need it most. Just my .02

RO isn't needed if you are getting solid results with regular tap water. It's handy for peeps with bad water & for perfectionists who want to know exactly what their plants are getting

 

[RoadKillSkunkHunt]

Personally, I feed right up until I chop. Opinions vary widely on this. I don't think the loss in bulk is worth it. Remember, the last two weeks is when they pack on the most weight; why would you deprive them of food when they need it most. Just my .02

RO isn't needed if you are getting solid results with regular tap water. It's handy for peeps with bad water & for perfectionists who want to know exactly what their plants are getting

Follow what @Nyarlathotep said.

You feed up until the day your chop in coco.

 

[BNiceee]

Follow what @Nyarlathotep said.

You feed up until the day your chop in coco.

Thank you guys for the knowledge I really appreciate it it’s helped me out a lot I’ve got a lot more confidence going into my next run also with foliar is it worth doing or is calmag better

 

[Florida_Mike]

They should be getting everything they need through their roots, imo.

Only thing that should be sprayed is stuff for insects, if/when needed.
If needed, plants should be sprayed within 60-90 minutes of lights out.

So yes, stick with calmag (or similar) and stay away from foliar feeding
when possible.

 

[Tle4]

I am a new grower still trying to learn but……
Have you checked your runoff ppm and ph and compared to what you are putting in. If those numbers are way different than what you are putting in, you might have a salt build up and nutrient lockout Also how high and intense are your lights. Leaves look like they may be slightly curling up on the leaves with the burn on the ends.

I didn’t use as much cal mag my first grow and my plants where kinda lacking and took way longer than the seed supplier said it would take to finish. My second grow I started using cal mag every feed and added Armor Si silica once a week and this grow looks way better. I did get salt build up and very high ppm a few weeks ago and had to flush them to get them down. They where getting spots like yours but on lower leaves. After flushing, they started growing much better again and no more spots.

 

[Tle4]

I am a new grower still trying to learn but……
Have you checked your runoff ppm and ph and compared to what you are putting in. If those numbers are way different than what you are putting in, you might have a salt build up and nutrient lockout Also how high and intense are your lights. Leaves look like they may be slightly curling up on the leaves with the burn on the ends.

I didn’t use as much cal mag my first grow and my plants where kinda lacking and took way longer than the seed supplier said it would take to finish. My second grow I started using cal mag every feed and added Armor Si silica once a week and this grow looks way better. I did get salt build up and very high ppm a few weeks ago and had to flush them to get them down. They where getting spots like yours but on lower leaves. After flushing, they started growing much better again and no more spots.

Also I checked out what ph fox farms says for Coco Mother Earth and and it says 6.3-6.8. It is pre buffered. I am growing in Coco Loco from fox farms and it recommends 6.2-6.8. It is higher ph than just Coco Cior

 

[Florida_Mike]

Also I checked out what ph fox farms says for Coco Mother Earth and and it says 6.3-6.8. It is pre buffered. I am growing in Coco Loco from fox farms and it recommends 6.2-6.8. It is higher ph than just Coco Cior

Be careful homie; manufacturers say all kinds of shit that is NEVER accurate. Don't listen to them; Listen to the people here that have been around the block a few times. Ph range for hydro (which coco/soil-less is a form of) should be 5.8-6.2 early and 5.9-6.3 late (my actual #'s I run in rockwool). Here's what AI says:

When growing in coco coir, the optimal pH range for your nutrient solution is:

• 5.7 to 6.0 during the vegetative stage
• 5.8 to 6.2 during the flowering stage

This slightly acidic range ensures that nutrients like calcium, magnesium, and iron remain available to the plants.

Pro tips:

• 5.8 is a good sweet spot for most of the grow.
• Letting the pH drift slightly within this range (e.g., 5.7–6.1) helps different nutrients stay available rather than locking out. [my highlight]
• Always calibrate your pH meter regularly and check runoff occasionally to make sure the root zone isn’t drifting too far out of range.

Me again:

If higher numbers are working for you, then by all means; run with them. Keep in mind though; you could possibly be running better.

I weigh Lbs & Ozs instead of Ozs & grams