Need help diagnosing issue with plant.

757Botanist · Jul 31, 2025

757Botanist said:
Yo! You and @Oldchucky have helped me tremendously. Just wanted to say thank you! Everyone else also, I wanna say thanks also.
The girls are recovering. The plant in question was thoroughly watered 1-1.5gals with 5ml of calmag added. I have been moving them to shade since this uptick in heat and humidity in Ole Virginny. .

Howdy boss! So I bought a ph tester just to cover my bases. Soil pH is sitting at 6.0. I’m guessing my flowering nutes and calmag are the culprits, should I invest in some pH up and down?

Currently only feeding once a week and watering with rain water in between.

LoveGrowingIt · Jul 31, 2025

757Botanist said:
So I bought a ph tester just to cover my bases. Soil pH is sitting at 6.0. I’m guessing my flowering nutes and calmag are the culprits, should I invest in some pH up and down?

6.0 is low for soil and risks micronutrient toxicity. 6.4 to 7.0 is recommended. I had a low pH problem with my current grow, so I used dolomite lime. It worked and the plants are doing much better. Dolomite lime has calcium carbonate and magnesium carbonate, so a separate calmag product isn't necessary. It will increase the pH up to 7.0. The recommended dosage is 1 to 2 tablespoons per gallon of soil. I started at 1 tbsp but ended up at 2.

Jmaes Mabley · Jul 31, 2025

LoveGrowingIt said:
6.0 is low for soil and risks micronutrient toxicity. 6.4 to 7.0 is recommended. I had a low pH problem with my current grow, so I used dolomite lime. It worked and the plants are doing much better. Dolomite lime has calcium carbonate and magnesium carbonate, so a separate calmag product isn't necessary. It will increase the pH up to 7.0. The recommended dosage is 1 to 2 tablespoons per gallon of soil. I started at 1 tbsp but ended up at 2.

Also, one can mix both Calcitic, and Dolomitic Lime.
Premier-Promix BX-HP, have both in them, and they use them at a rate of 2/3 Calcitic Lime to 1/3 Parts Dolomite. Calcitic is better for faster PH changes, and Dolomite is a better source of Magnesium. Calcitic, is of course a better source of Calcium.
So if one uses a cup of lime, it can be used at a rate of 2/3 cup Calcitic Liime, to 1/3 Cup Dolomite.

Calcitic, is also better, in clay soil, as Dolomite, can turn soil, into concrete.

757Botanist · Jul 31, 2025

Jmaes Mabley said:
Also, one can mix both Calcitic, and Dolomitic Lime.
Premier-Promix BX-HP, have both in them, and they use them at a rate of 2/3 Calcitic Lime to 1/3 Parts Dolomite. Calcitic is better for faster PH changes, and Dolomite is a better source of Magnesium. Calcitic, is of course a better source of Calcium.
So if one uses a cup of lime, it can be used at a rate of 2/3 cup Calcitic Liime, to 1/3 Cup Dolomite.

Calcitic, is also better, in clay soil, as Dolomite, can turn soil, into concrete.

Howdy James,
I guess my biggest concern is not adding in tooo much into my soil. I currently use FF bushdoctor for my calmag and TPS SIGNAL, Bloom, and 3-1 for my preflower-harvest nutes. Will the primer promix mesh well with what I’m using? If I’m understanding things I need to get my pH back to an ideal 7. I’m reading that 6 is ok but I have one that is at 5. I’m literally omw to Ace Hardware for some pH balancing solutions!?!

GNick55 · Jul 31, 2025

757Botanist said:
Howdy boss! So I bought a ph tester just to cover my bases. Soil pH is sitting at 6.0. I’m guessing my flowering nutes and calmag are the culprits, should I invest in some pH up and down?

Currently only feeding once a week and watering with rain water in between.

i’d quit using the rain water, especially if it’s sitting until being used like in a rain barrel

LoveGrowingIt · Jul 31, 2025

Jmaes Mabley said:
Also, one can mix both Calcitic, and Dolomitic Lime.
Premier-Promix BX-HP, have both in them, and they use them at a rate of 2/3 Calcitic Lime to 1/3 Parts Dolomite. Calcitic is better for faster PH changes, and Dolomite is a better source of Magnesium. Calcitic, is of course a better source of Calcium.
So if one uses a cup of lime, it can be used at a rate of 2/3 cup Calcitic Liime, to 1/3 Cup Dolomite.

Calcitic, is also better, in clay soil, as Dolomite, can turn soil, into concrete.

Good point. I forgot this is outside in sunlight. For LED lights, Mg is a necessary amendment.

757Botanist said:
I need to get my pH back to an ideal 7.

My understanding is that a pH of 7.0 is not ideal for soil. It's the upper limit. Above 7.0, macronutrients precipitate out of solution. It'd be better to target 6.5 or thereabouts.

757Botanist · Aug 13, 2025

Update: Flower power! Girls bounced back after heatwave. Now the push to November.

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Need help diagnosing issue with plant.

Need help diagnosing issue with plant.

757Botanist

LoveGrowingIt

Jmaes Mabley

757Botanist

GNick55

LoveGrowingIt

757Botanist

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