How do I mix Jack's 321?

Mar 30, 2020
1 min read
We get a lot of questions asking about how to properly mix our Jack's 321 program (and how to know if something isn't mixed properly). Our very own "Wild Bill" Cody is here to give you the definitive mixing lesson straight from the JR Peters Laboratory.
Our Jack's 321 program is here to help you get your grow operation performing at optimum levels. To further dial in your hemp, cannabis, or other controlled environment crops check out our grow schedules page.
And Remember It's:
- 3.6 grams/gallon Part A (5-12-26) and dissolve then add
- 1.1 grams/gallon Epsom Salts and dissolve completely then add
- 2.4 grams/gallon Part B (Calcium Nitrate)



Great resource for anyone who wants a straightforward explanation of the Jack’s 321 mixing process. Breaking down the order of Part A, Epsom salts, and Part B makes the instructions much easier to follow, especially for growers troubleshooting their nutrient routine. I Microsoft Azure Consulting Services recently noticed in a related discussion, and I appreciate how clearly this post focuses on practical information.
What EC should I be getting each stage?
I put 1/2 gallon of warm water and put it in a jug. I then weigh out my ratios for how many gallons are in my system's of part A, epsom salts and Part B. Part A first then I hit it with the drill with the epoxy mixer attachment. It mixes super fast and thoroughly. I then add the epsom salt ratio per gallon for my system, mix then part B and mix. I put it in the reservoir and check numbers after an hour.
Numbers look good after application
Once my solutions mixed. (In the correct order). My ph sits around 6.8.
Should I add ph down at this point? Would that cause any ill effects. I’m trying for 6.0 ph. I’m also growing in coco
why is my solution a red color sometimes and a clearer green other times? What could be going wrong here?