This plant shares a [Grow Box](https://www.agardenpatch.com/ with the pictured tomato plant. I have numerous other grow boxes and potted plants (all tomato) and they all have PH of around 6.5 or so.
The PH of the cannabis plant soil is 4.5. I have tried hard to raise the PH by using PH Up and also Baking Soda, adding them to the water, and I cannot get PH to budge. I used an entire pint of PH Up and 1/3 box baking soda. How can I get the PH up?
Next, look at the yellowing leaves. I trimmed off all yellow leaves just yesterday, so these have yellowed in less than 24 hours.
They need air in between as @beachglass stated, and they could also be fighting at the root level for space. Without knowing what soil and nutrients it’s hard to tell what’s going on with ph. Most would use a flushing additive and follow with a feed to get pH back in line. That’s a lot of baking soda dumped on your soil.
The yellowing leaves could be normal aging, it doesn’t appear there are any larger fan leaves towards the top out of whack. But pH can cause it as well, especially if it’s happening overnight.
I could be wrong, but you might want to get those plants apart, if possible. If it’s the only container outta whack, and the only one with 2 different types of plants.
If you have more than one plant in the soil, the plants will compete for resources. Been there, done that. I ended up having to garbage both due to going down hill and no way to transplant one. Never made that mistake again.
Thanks for your responses. I have removed the tomato plant, and just added, beleve it or not, another entire pint of Ph Up to the 4 gal water reservoir. At the moment the soil shows 4.5 on 2 different meters. If PH does not change soon, I’m thinking about dumping a full cup of baking soda on the soil.
Interesting point. The tomato plant had about 10 small tomatoes, and I noticed that all tomoatoes were dark brow, like rotted looking, on the lower halves. What does this tell us ??? Something aint right here.
Are these soil probe type? Because most are truly worthless. A better method if runoff isn’t available is to run a slurry test: 1/2 cup distilled water, 1/4 cup of your soil media mixed in and let stand for 30 minutes then test the liquid.
What kind of PH UP are you using? The stuff I have is bloom city was cheap off of Amazon and only needs a few drops per gallon and that changes it drastically. If I had even half a cap full it cna change the PH +/- 3 or 4 easily. A whole pint for 4 gallon seems like a ton. I’m new to all this myself but was just curious