What’s wrong with my sativa plant!!

So this current grow and my last grow, I had a sativa each time and both times when I get into week five or six of flowering, the leaves on the whole plant starts to turn yellow. I’ve checked pH levels, nutrients, lighting, temperature, and humidity I don’t know what I’m doing wrong. Meanwhile, my Indica plant that’s sitting right next to it is doing amazing. I do the same feeding schedule and nutrients for both plants and they both always get everything at the same time….. hopefully someone in here can help me figure this out, because if not, I think I’m just gonna stay growing Indica plants

More info would help > medium, type of food, ppms's, etc. but I have found the sativa's I've grown do not take as many nutrients...

Cheers

chuckeye said:

More info would help > medium, type of food, ppms's, etc. but I have found the sativa's I've grown do not take as many nutrients...

Cheers

Click to expand...

Using soil, coco coir, with worm castings and compost manure on top. I’m using a Vivo sun vs2000 light. Using the tps nutrient kit.

Jmoney0523 said:

Using soil, coco coir, with worm castings and compost manure on top. I’m using a Vivo sun vs2000 light. Using the tps nutrient kit.

Click to expand...

I also use blackstrap unsulphered molasses 15 ml per gal

Phosphorus deficiency.

I think it's just hungry depending on how long u flower

Johnny15 said:

Phosphorus deficiency.

Click to expand...

It’s getting plenty of phosphorus

TrichRider said:

I think it's just hungry depending on how long u flower

Click to expand...

I’m in week 7 now. Almost all the leaves are yellow now. Idk I can’t figure it out.

Jmoney0523 said:

It’s getting plenty of phosphorus

Click to expand...

If you say so.

Did both grows use the same coco coir? Could that be the issue? I watched a video by Gary's Best Gardening and he said when he buys plants from a know distributor that uses too much coco coir eventually the plants turn yellow. He pulls all plants from this medium washes off the roots and replants in a different mix. He stresses compost on top only, no coco coir. He also states to much compost decaying in the soil off gasses the oxygen to the roots and cause issues as well.

Obviously some plants are more tolerant to all this than others.

Generally not advisable to mix substrates. Soil and coco are very different mediums. I’m impressed the indica is holding up. Coco as a medium should never be allowed to dry. It’s completely inert, so it also requires feeding every time water is introduced. Soil and organic material behave differently and absorb and distribute micronutrients through the dirt, but take time to breakdown and become plant available.
I’m guessing this is contributing but all I could suggest is try and just run water through her and see if she begins to level out. GL!

When you say same feed ing schedule and everything at the same time do you mean you feed both the same water mix each time?

No two plants “ feed “ the same - let’s put that to rest.

It is cannibalizing everything from itself and is sadly weeks from finish. Most sativas can run 10-14 weeks or more. Mixing mediums always seem to cause problems - then trying balance ph between them. Plus you now dumping compost on it too.

You literally could have saved the drama by running it straight soil or coco alone. It is severely starved and locked out. All of those important ( energy producing ) leaves are now on vapors. No pigmentation for leaves to photosynthesize properly. Soon they will go necrotic or fall off . Those flowers are nowhere near a finish .

As far as why it happened …. Grower error.

BTW - the other one is looking like some fans are yellowing too.

Mixing coco coir (coconut fiber) with soil can offer benefits, such as improved aeration and moisture retention, BUT it can also create some challenges. Here are potential problems to be aware of:

1. Nutrient Imbalances:
• Coco coir has a high cation exchange capacity, which can affect nutrient availability.
• It can initially bind with calcium and magnesium, leading to deficiencies in these nutrients for plants if not properly amended.

Molasses has ph of 8.both plants are not healthy just the indica is less.

Maybe this https://www.growweedeasy.com/cannabis-plant-problems/calcium-deficiency

Thats the closest to your indica i have found.
Do any leafs have spots?

Jmoney0523 said:

So this current grow and my last grow, I had a sativa each time and both times when I get into week five or six of flowering, the leaves on the whole plant starts to turn yellow. I’ve checked pH levels, nutrients, lighting, temperature, and humidity I don’t know what I’m doing wrong. Meanwhile, my Indica plant that’s sitting right next to it is doing amazing. I do the same feeding schedule and nutrients for both plants and they both always get everything at the same time….. hopefully someone in here can help me figure this out, because if not, I think I’m just gonna stay growing Indica plants

Click to expand...

How do you know the plant isnt supposed to go into autumn colours wen near finish. What strain is it. I know alot of sativas ( not that early) that towards the end the leaves yellow and most drop off.
Looks like yours need a proper complte feed dose anyway. Have you been underfeeding

Jmoney0523 said:

I also use blackstrap unsulphered molasses 15 ml per gal

Click to expand...

probably locking out all the nutrients by adding too much molasses.
black strap shouldn't be used that consistently, once a week at most and thats with a media that is closer to inert, with what you have in the soil is probably is simply too much nutrients, too often.
cannabis plants don't really need that much nutrients at all, especially in a soil with manure in it.
i've grown 8 foot tall plants clone to finish in the super bright CA sun using nothing but pro mix and, kelp meal and manure, fed with nothing but water.
start to finish.
absolutely by FAR the most common mistakes i see over and over, generation to generation, is by doing too much.
the mistakes are almost always the same two, watering when the soil isn't completely dry and over feeding.

GrnMonStr said:

Did both grows use the same coco coir? Could that be the issue? I watched a video by Gary's Best Gardening and he said when he buys plants from a know distributor that uses too much coco coir eventually the plants turn yellow. He pulls all plants from this medium washes off the roots and replants in a different mix. He stresses compost on top only, no coco coir. He also states to much compost decaying in the soil off gasses the oxygen to the roots and cause issues as well.

Obviously some plants are more tolerant to all this than others.

Click to expand...

Yeah, I only recently put the compost on top because overtime the soil loses the nutrients. But no, I use different mediums, every grow.

greasemonkeymann said:

probably locking out all the nutrients by adding too much molasses.
black strap shouldn't be used that consistently, once a week at most and thats with a media that is closer to inert, with what you have in the soil is probably is simply too much nutrients, too often.
cannabis plants don't really need that much nutrients at all, especially in a soil with manure in it.
i've grown 8 foot tall plants clone to finish in the super bright CA sun using nothing but pro mix and, kelp meal and manure, fed with nothing but water.
start to finish.
absolutely by FAR the most common mistakes i see over and over, generation to generation, is by doing too much.
the mistakes are almost always the same two, watering when the soil isn't completely dry and over feeding.

Click to expand...

My last grow, I kind of mess around with different nutrients. But this grow I used TPS starter kit and went by the guide that they gave me on the back of the box. I’ll try to attach a picture. But it breaks it down week by week.

Jmoney0523 said:

Yeah, I only recently put the compost on top because overtime the soil loses the nutrients. But no, I use different mediums, every grow.

Click to expand...

try to dial it in with a specific soil mix, and then finetuning it from there.
one thing i like to stress to people is to try a grow without ever adding anything to the soil.
see how far a plant can actually go with nothing but the soil and water, you'd be amazed on how LITTLE the plant actually needs.
i prefer simpler mixes with compost, steer manure, kelp and alfalfa as the inputs.
I also avoid coco, many will disagree with that, but in my experience, peat is the preferred media.
one of the most profound realizations i've ever had was realizing that cannabis is a plant that grows best off it's own detritus from the previous years growth, so i prefer to amend an existing soil mix with composted cannabis leaves and stems from previous grows, THAT coupled with steer manure, alfalfa and kelp gets me the best results i've ever had in over 30 yrs of growing. I have gallons and gallons of soil that is decades old.
even omitting the manure, JUST kelp, alfalfa and cannabis compost will get you the best results you've ever had.
Taste, quality, and yield.
with an emphasis on TASTE.