Hello, i have 4 wedding cake about 2 inches tall, feminized photo, in coast of Maine seed mix. I will be transplanting when the time comes into 5 gallon fabric pots with promix hp with mycorrhizae ( i believe there is no fertin this ). My question is this, i will for the first time ever be using jacks 321 ( nervous and excited) do i begin with this regimen after i transplant or do i start with jacks while still in solo cups?
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The coast of Maine is amended and will feed for approximately 6 weeks in a larger vessel, it’ll carry that seedling until transplant with no issues. I would mix the jacks at full strength drench the ProMix and transplant. Treat the ProMix like coco for PH 
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Thanks, I’ve never used coco so what ph?
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I believe you would treat it like hydro so 5.8 to 6.2 but could be wrong.
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5.4. - 6.2 is hydro/coco 
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Edit 5.5 - 6.2
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So after i mix my jacks 321 and its ready, i then ph the solution and then feed or ph my water to start and then add jacks 321 ?
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Mix nutes up then PH standard practice! To best of my knowledge.
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Ok thanks thats how ive always done it with other other nutrient programs, this is my first go with jacks so i wasn’t sure.
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I fill a quart jar 2/3 with water, weigh and add part A and shake til dissolved, weigh and add epsom and shake, add weigh and add part B and shake til dissolved. Add to appropriate amount of water and stir. Adjust ph if needed and feed them to 30% runoff in Promix.
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You wouldn’t happen to know how long a gallon mix of the 321 will keep in a cool dark spot, for instance would I be able to use it again 2 or 3 days later or best to mix a smaller batch each time ?
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The methods stoners come up with to make things easier! 
Definitely gona try that out my next feed 
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I have been told it’s best to ph water before adding nutes. But the first time is a learning curve. You may have to adjust you numbers up or down.
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I will have to research that a bit more just to be on the safe side, thanks for your input, here they are so far, 9 days in solo cups 18 hrs light 6 hrs dark lower to mid seventies temperature and lower to mid sixties humidity would like humidity higher but thats with humidifier in tent
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Also if you add cal mag or silica do it before you add your other nutes.
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I don’t, I always mix fresh. You can put a clear solo upside down for a humidity dome, just take it off when leaves spread out and touch sides of cup.
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Cal mag add anytime, silica add last.
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Always ph last thing. Any thing you add after phing will likely change it.
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With jacks 321 i believe the part b covers the calcium part and the epsom covers the magnesium needed
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