Get Help for Cannabis Plants Problems as Quickly as Possible!

[Bluey]

I fertigate, absolutely!

[Rootsruler]

I agree with Gingerbeard and Bluey .

I like Bluey multiple feed strategy in coco. Similar to a Fertigation process. Something you may want to look into if you continue in coco. Most of the highest yields I see in coco tend to run Ferti Irrigation or some variant of it.

[Bluey]

I run just coco also and at that stage I'd be feeding them between once and twice per day and increasing to 3 possibly 4 times a day if large plants or in small pots...I call 7gal small for photos. 6 to 6.3 works for me also.

It might help if you had an EC meter to measure the amount of nutrient in your water. I find that important given the way I grow. Without it I'd be guessing.

Edit. The pH in your medium likely ran too high because you are not feeding them enough. Also give decent runoff once or twice a week, say 10 to 20% of the input on that feed.

[Gingerbeard]

I use Dynagro in coco. Try lowering your pH to 5.8 and do not worry about runoff. My 5-gallon bags take 1-gallon of full or better dose of nutrients when they get going.
Learn what your bags feel like just before and just after watering. That's a good way to tell how dry they are.

[Shenandoah]

Gingerbeard Thanks for the link, I will check it out. I figured there probably isn’t a ton I can do now, but it would be great to get better for next time!

Bluey No soil, just coco/perlite. I’ve been pH adjusting my water to between 6-6.3. I tested the runoff and it was at 6.75-6.85. I adjusted the water to 5.5 for the next waterings until the runoff was the same as the input. Only got it under control a couple of days ago.

Rootsruler I’ve been giving 1tsp/gal of nutrients. But if they’re short on nutrients, maybe I should have been feeding/watering more often?

[Rootsruler]

What was the dosage Dyna Gro recommended? Looks like they were underfed.

[Bluey]

What is your pH inputs range? Is this a soil grow or a coco grow and how did you plan to manage it given each have different pH values about 0.5 variance?

What is the ideal pH ranges for your medium?

I'd stick with one or the other for ease of management.

You have probably washed out most nitrates out of the soil with your runoff. Likely it needs feeding more often but you need to get the pH on point and I don't know how to work that out with two different mediums.

[Gingerbeard]

What you have going on is common in late-stage flowering. It is not typical, just common.
Bad news is you have all sorts of nutrient lockout issues, and it is too late to do anything about what has happened to this point. Good news is you are on track for some fine dope, seriously.
You are about to get a lot of helpful advice that may help you avoid this in the future. The pictures in the link are a lot prettier but what you have going on, they have going on, and theirs is a little more genetic and a little more on purpose.
On the same website is information on what to look for when harvest time comes.
The Cannabis Autumn Color Effect (Get Colorful Leaves!) | Grow Weed Easy

[Shenandoah]

HELP!!

Problem: first time grower here. Plants are 8 weeks old, should be harvesting in a couple weeks. About at the start of flowering they started yellowing and showing brown spots. It’s worse on the lower leaves, but the tips at the top are brown and curled also. First photos are when it started, later photos are how it looks now.

Tested the runoff pH and it was too high, so corrected that over a couple of waterings. Also moved the lights further away so they are getting around 750-800 umol. But they have continued to get more crispy.

Setup: 300W AC infinity light, fox farms 70% coco, 30% perlite, dynagrow liquid nutrients

Watering: I way over watered when they were seedlings, but I’ve tried to get it back on track. Currently giving ½ gallon every 3 days and getting about 5% runoff. Could I be giving too little water now?

Nutrients: gave 1 tsp/gal of the dynagrow- Grow until 2 weeks ago when I switched to Bloom

Temp/humidity: Temp 70-80 deg, humidity a little low at 30-40%

Any suggestions would be helpful!

[Bluey]

Here's an older article on root zone health explaining how we thought it all worked back in 2016.

https://www.cannagardening.com/articles/root-zone-temperature-and-plant-health

Dissolved 0² or DO does leave the surface water over a period of time but it can take a little while to reach equilibrium, eg. overnight, without help, eg. Stratification. It is leaving the water in the root zone though so can it still be used by the plant or soil microbes? Is it raising the 0² in the medium which in turn keeps it dissolved longer in the H²O?

CO² at the roots which is also beneficial to a healthy crop is 200 times more soluble than O² in water. That is my understanding although the above article states CO² serves no purpose for cannabis in the root zone..I'm not so sure about that.

[Bluey]

Here's an older article on root zone health explaining how we thought it all worked back in 2016.

https://www.cannagardening.com/articles/root-zone-temperature-and-plant-health

Dissolved 0² or DO does leave the surface water over a period of time but it can take a little while to reach equilibrium, eg. overnight, without help, eg. Stratification. It is leaving the water in the root zone though so can it still be used by the plant or soil microbes?

CO² at the roots which is also beneficial to a healthy crop is 200 times more soluble than O² in water. That is my understanding although the above article states CO² serves no purpose for cannabis in the root zone..I'm not so sure about that.

[Rootsruler]

Bluey This was a debate that I would see when I was working at licensed grow ops. Most of the botanist said that cooler water does hold more O² but that it dissipates quickly trying to equalize with the atmosphere. They felt that warmer root temperatures allowed a lower viscosity of the sap in the roots helping the plant move nutrients easier. Feed temps were usually around 72².

[Bluey]

Rootsruler keep water temp down around 20⁰C or lower for maximum O². But remember all compounds in air are beneficial for healthy roots especially CO² and I'm guessing N also if growing in soil.

[Eclipce]

I have improved the watering and am still working on it. Previously, I was watering too quickly, and the water would just run out of the pot. The plants are starting to feel better now.

[Rootsruler]

I'm going to start playing with fertigation as a way to maximize the O² exchanges.