Jacks 321

Capt. C

Saltwater Cowboy
Staff member
The Jacks 321 recipe has become one of the most popular nutrient regiments over the last few years. Lots of thanks to GreenGene for his Youtube video released in May 2018 where he discusses everything related to 321.

If you're not familiar with it, Jacks 321 is a three part dry powder nutrient recipe. It combines Jacks 5-12-26, Calcium Nitrate, and Epsom Salt in a 3-2-1 ratio to achieve an elemental breakdown of 728.286 PPM when used at full strength.

Here's the breakdown:
142.6 Nitrogen (N)
49.8 Phosphorus (P)
205.3 Potassium (K)
93.1 Magnesium (Mg)
114 Calcium (Ca)
119.3 Sulfur (S)
2.863 Iron (Fe)
0.143 Zinc (Zn)
0.476 Boron (B)
0.143 Copper (Cu)
0.085 Molybdenum (Mo)
0.476 Manganese (Mn)
0.000 Silica (S)
0.000 Sodium (Na)
0.000 Chloride (Ci)
728.286 Total
Hey @ricky_simples just wanted to get your thoughts on something. My filtered tap water is just under a 100 ppm. If i mix at the standard measures that would put me at 838 ppms at full strength. Should i concern myself with that or should i try and compensate for the 100 ppm when mixing? Also @Texagonian or @Gweedo's Growroom any thoughts would be welcome.
 

Capt. C

Saltwater Cowboy
Staff member
I run my upper limit at about 900 but that's including my tap, it varies from 105 to 120 ppm so I'm actually closer to about 750ppm of actual nutes
Cool that is very close to my tap. Seems like in the past i would start to risk burning the tips at over 8-900 ppms but was more than likely to much of something in the mix. Really excited about using jacks after watching greens grow( or whatever his name is) video on u tube.
 

ricky_simples

In Bloom
Hey @ricky_simples just wanted to get your thoughts on something. My filtered tap water is just under a 100 ppm. If i mix at the standard measures that would put me at 838 ppms at full strength. Should i concern myself with that or should i try and compensate for the 100 ppm when mixing? Also @Texagonian or @Gweedo's Growroom any thoughts would be welcome.

If I were using 100 PPM tap with Jacks instead the RO I'm using now, I wouldn't do anything differently. That's pretty clean water.
 

Capt. C

Saltwater Cowboy
Staff member
Jacks 321 switch up was very easy. I am using volume mixing it is much easier than weight. Switched right at flip and have only used Recharge as the only other additive i have used besides the Jacks. I have not used a drop of PH down or Calmag since flipping. With that being said i have not added the silica since the flip and if doing so will most likely need PH down. My tap is around a 100 ppm and with the Jacks full strength comes out at 900 ppm. I would like some input from other Jacks users as to when i should start cutting back on those ppm's or just wait till flush. I am coming up on week 5 and still running full strength with very little if any tip burn.
 

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Texagonian

In Bloom
Jacks 321 switch up was very easy. I am using volume mixing it is much easier than weight. Switched right at flip and have only used Recharge as the only other additive i have used besides the Jacks. I have not used a drop of PH down or Calmag since flipping. With that being said i have not added the silica since the flip and if doing so will most likely need PH down. My tap is around a 100 ppm and with the Jacks full strength comes out at 900 ppm. I would like some input from other Jacks users as to when i should start cutting back on those ppm's or just wait till flush. I am coming up on week 5 and still running full strength with very little if any tip burn.
I’m running full strength and am going to the end that way, up till flush that is. I’m sure you’ll get some more input @Capt. C . I’m loving using jacks. I won’t have to buy nutrients for years based on my scale of growing. Hope you and your family are doing well and staying safe. 🙏🏼✌🏼
 
Since my former go-to, MaxiBloom, has been mostly unavailable and Megacrop is still figuring out their formula, I've been looking for another water soluble powder.

I've been interested in Jack's for a while but couldn't find a source in Canada. I admit I wasn't beating the bushes, but a basic search was unsuccessful. Anyway, through RUI, I learned of a BC store that had it and I made an order for 5kg each of 5-12-26 and Cal-Nit a few days ago. It was under $100 CAD delivered and will provide me with well over a year worth of nutes, likely closer to 2 years.

While I was waiting, I contacted JR Peters in the States and their guy gave me the name of their wholesaler, whose website gave me the name of an authorized dealer. Turns out it's a gardening store not far from me that I visit regularly. Sent them an email and learned I can make an order for the next shipment or get 15 Kg of Jack's 7-11-27 for $80 and 25 Kg Cal NIt for $42 right now.

I was annoyed for about 5 seconds that I didn't wait and save a few bucks, but after looking at it realistically, it isn't a big deal. I can probably do without 100 pounds/5years+ worth of nutes taking up space as well.

Looking forward to dialing in the 321 system once the current MaxiBloom/Megacrop mix I've been using runs out.

Between low cost-high, performance nutrients and off the shelf, screw-in LEDs, top shelf cannabis can be grown these days for next to nothing.
Fuck all the bullshit outside, I'll be in my tent tending to the girls. Let me know when it's safe to come out. :)
 
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