ProMix HP Organic Amendments Recipe / Recommendations

Hi all, I’m switching to ProMix and looking for insights or suggestions.

In past runs I’ve used FFOF with 20% perlite, 20% EWC, DynoMyco and Dolomite Lime and then top dressed with DTE 4-4-4 and 4-8-4 throughout the grow cycle. I’m tempted to run the same recipe simply swapping FFOF with ProMix HP, but have heard HP is more like using coco. I get the sense I may want to amend with 4-4-4 from the beginning and not wait a month since HP is not a charged soil mix, but I am all ears for any advice to the contrary.

Any and all thoughts welcome and appreciated. Thanks!

Promix is a peat based soil less media. So it’s more like a semi-hydro grow. I’ve used it, and FFOF, I prefer the FFOF, but I only tried promix once.

I’ve been using Pro Mix organic for the last four grows as a base. Amended with: EWC, additional perlite, GG 4-4-4, bokashi fermented fertilizer. That’s the base and I’ll tweak w/ tea and feed (fish fert, kelp etc) during grow. No complaints thus far.
Edit: yes, it’s peat based like FFOF and has some pre-charge

I would for 100% for sure, amend, from the start.

Ive used Promix BX for a very long time. I usually use chemicals, But, when I have grown Organic, I used.

12-11-2-Peruvian Seabird Guano
0-0-52-Potassium Sulfate
Kelp
Azomite
Biochar
Calcitic Lime
Dolomitic Lime.

Promix, uses a mix of Calcitic, and Dolomite, and they use it at a ratio of?
2/3 Parts Calcitic Lime, and 1/3 Parts Dolomitic Lime. Calcitic is best for faster PH Change, and added Calcium, and Dolomite is used for longer term PH Buffer, and Magnesium.

I make teas with the Seabird Guano, and Kelp. Top Dress 0-0-52, every 6 weeks.

Promix HP, wont drain as fast a coir.

DMChiz said:

I’ve been using Pro Mix organic for the last four grows as a base. Amended with: EWC, additional perlite, GG 4-4-4, bokashi fermented fertilizer. That’s the base and I’ll tweak w/ tea and feed (fish fert, kelp etc) during grow. No complaints thus far.
Edit: yes, it’s peat based like FFOF and has some pre-charge

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Thanks this is super helpful! When you pre-amend with GG, how many tbsp/gal do you typically drop in?

jimbonorman said:

Thanks this is super helpful! When you pre-amend with GG, how many tbsp/gal do you typically drop in?

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I premix for all my containers so in terms of measurement, about half this tub goes into the mix with everything else. I’ll mix up for 5-6 10g pots. My only caution with the ProMix organic is that it needs to be wet as you mix. It can be hydrophobic, so adding moisture as you go is crucial. Happy growing

DMChiz said:

I premix for all my containers so in terms of measurement, about half this tub goes into the mix with everything else. I’ll mix up for 5-6 10g pots. My only caution with the ProMix organic is that it needs to be wet as you mix. It can be hydrophobic, so adding moisture as you go is crucial. Happy growing
View attachment 5382966View attachment 5382967

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Awesome - thanks for all the info!

Typical recommendation for pre-amending is 2-3 cups per cubic foot (7.5 gallons). Looks like Gaia recommends more like 1.5 cups per cubic foot (3 tbsp per gallon) in their directions...

weedstoner420 said:

Typical recommendation for pre-amending is 2-3 cups per cubic foot (7.5 gallons). Looks like Gaia recommends more like 1.5 cups per cubic foot (3 tbsp per gallon) in their directions...

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Yeah I checked DTE since that’s what I use and they recommend more like 2 tbsp per gal.

jimbonorman said:

Yeah I checked DTE since that’s what I use and they recommend more like 2 tbsp per gal.

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Maybe the npk values of the DTE are higher...? Or they want you to top-dress more/more often...?

I've been using Espoma products in my soil for a while, and they recommend 2 cups per cf.

weedstoner420 said:

Maybe the npk values of the DTE are higher...? Or they want you to top-dress more/more often...?

I've been using Espoma products in my soil for a while, and they recommend 2 cups per cf.

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Bout the same

Phytoplankton said:

Promix is a peat based soil less media. So it’s more like a semi-hydro grow. I’ve used it, and FFOF, I prefer the FFOF, but I only tried promix once.

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I was thinking of using Pro Mix for a grow and have used Fox Farm soil for three years... Now I'm not sure if I should change anything up..

ive been using promix for about a decade. my take away is this its mixed on conveyor belts and vacuum sealed in large bales generally i find the amount of dolomite lime thats added is often to low and is used up before the grow is finished which lowers the ph causing deficiencies. throw extra dolomite lime in it and your generally good. aside from that use hydroponic nutrients if you can keep the media around 6.1ph your plants will be happy for the most part