Jacks 321

ricky_simples

ricky_simples

In Bloom
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
 
ricky_simples

ricky_simples

In Bloom
Gweedo's Growroom said:
It's still pretty much a secret in my area, and I'm leaving it that way ??? when I tell em my cost they laugh at me, no way it's good if it's that cheap is what I get in response,???
Click to expand...

It's unbelievably inexpensive to run. The first container I purchased was 4lbs, and it lasted just about 1.5 years, which I think was 6 grow cycles. Epsom Salt is dirt cheap and Calcium Nitrate doesn't cost much either. I run with the big boy bags now (25lbs) and don't think I'll need to purchase nutrients for another 3-4 years.

I haven't touched my bottle of Cal-Mag since I began running Jacks, and that's using Coco and RO water.
 
Texagonian

Texagonian

CHOOSE YOUR TITLE
Figured I’d chime in on this. I watched the Greene Gene jacks episode o YouTube and that’s what sparked my interest. Found a farm and garden store local that sells the 25 lb bag of jacks hydro part a if you will for 44 bucks and some change. Cal nitrate I got at another wholesale fertilizer place locally and ended up with a 50 lb bag because that’s all they had for 20 bucks and then a 8 pound bag of epsom for 7 and change. I won’t be needing nutrients for a very very long time. Don’t be shy at your farm and garden stores is what I’m getting at, they might even order you some if they don’t have it. ?✌?
 
ricky_simples

ricky_simples

In Bloom
I'm going to post Kootmed's guide to using Jacks 321. On my current run of plants I locked them out by running my recipe at full strength too early. It was creating a lockout in the rizosphere / rootzone and the plants were showing heavy mag deficiencies. The EC and PPM were dialed in too, so that wasn't the issue.

So two days ago I flushed each container with 1 gallon of RO water (each plant is in a 3-gal). 24hrs later my drippers came on and began watering again (business as usual 1.8 EC 6.0 PH). Two days later and it's night and day how much happier they are.

Moving forward when growing from seed I'm going to start with a 33% - 50% strength recipe for the first week or two, and then once they establish a rootzone I'll increase to full-strength.

Here's a couple photos of the ladies now. You can still see striations on the leaves from the deficiencies. Now that they're healthy, they'll be getting flipped at the end of this week.
IMG_20200227_063141.jpg IMG_20200227_063136.jpg
 
Gweedo's Growroom

Gweedo's Growroom

Yoda Fired Up
That's about how I've been doing it, 350 ish for babies, 450 to 550 for teens and about 850 max for me in late veg and flower, and I mix my stock at 3-2.1-1 so I've never even come close to actual full strength, but I am in hydro, I know greengenes goes way higher way earlier in dtw, I'd fry my ladies at 1400ppm lol
 
Last edited:
ricky_simples

ricky_simples

In Bloom
Gweedo's Growroom said:
That's about how I've been doing it, 350 ish for babies, 450 to 550 for teens and about 850 max for me in late veg and flower, and I mix my stock at 3-2.1-1 so I've never even come close to actual full strength, but I am in hydro, I know greengenes goes way higher way earlier in dtw, I'd fry my ladies at 1400ppm lol
Click to expand...

What PPM do you typically start at for rooted clones?
 
jpcyan2

jpcyan2

In Bloom
Was Jack's Fertilizer formerly known as Peters? Many years ago, Peters 10-50-10 was what I ran for bloom consistently, in hydro and soilless /soil.
It was the only readily available brand that had additional Mag. It was even less expensive than MirGro here.
I never had an issue with Magnesium deficiency until Peters was no longer available.
When I switched to the expensive, over hyped, liquid brands at the hydro store, Mag deficiency was almost always an issue.

Good stuff, thanks for the info, I'll be looking into Jacks for sure.
 
ricky_simples

ricky_simples

In Bloom
jpcyan2 said:
Was Jack's Fertilizer formerly known as Peters? Many years ago, Peters 10-50-10 was what I ran for bloom consistently, in hydro and soilless /soil.
It was the only readily available brand that had additional Mag. It was even less expensive than MirGro here.
I never had an issue with Magnesium deficiency until Peters was no longer available.
When I switched to the expensive, over hyped, liquid brands at the hydro store, Mag deficiency was almost always an issue.

Good stuff, thanks for the info, I'll be looking into Jacks for sure.
Click to expand...

I believe JR Peters is the name of the holding company and the product line is called Jacks. I'm totally guessing so don't quote me on that. But yeah I would think you're talking about the same company.
 
ricky_simples

ricky_simples

In Bloom
Z71banshee said:
Does this work in soil as well?
Click to expand...

Yes. I have a buddy who's just wrapping up his first grow using Jacks 321 and Happy Frog soil. But know that soil has nutrition in it, unlike coco which is inert. This means that you probably wont need to feed as often in soil, and a when you do it will be at a lesser strength than you would with coco.

If I was growing in soil containers using Happy Frog or Ocean Forest, I'd feed with straight water for the first month or so.
 
Z71banshee

Z71banshee

In Bloom
ricky_simples said:
Yes. I have a buddy who's just wrapping up his first grow using Jacks 321 and Happy Frog soil. But know that soil has nutrition in it, unlike coco which is inert. This means that you probably wont need to feed as often in soil, and a when you do it will be at a lesser strength than you would with coco.

If I was growing in soil containers using Happy Frog or Ocean Forest, I'd feed with straight water for the first month or so.
Click to expand...
I’m using Pro Mix at the moment for moms and have been on just a water feeding. About a week ago, two have developed deficiencies. I was using Megacrop when I did feed, but if the plants were healthy and I give them a half feeding, in a day or two they are sad and missing something. This is ok right now as it will help me to identify and treat issues and I’m just maintaining “health” until my flower room is up and running. At that point, I want to start with a nutrient/feed regimen that is known to work AND then grow my own regimen off that. Leaning towards Jacks or Growth Science. Megacrop is simple, but I think it’s a little too simple. I just built a tea brewer and have some brewing now. I hope this will be good for health maintenance with moms.
 
ricky_simples

ricky_simples

In Bloom
My understanding that is if you're in pro mix out of the bag that it should be treated as coco or rockwool. Use a hydroponics PH and also feed at the appropriate strength. Could be the 1/2 strength feedings aren't providing enough nutrition. Could be the PH is off?

I'm a big Jacks fanboy, never used MC so I can't speak to it. I know of lots of growers who do use MC with high success.

Have you considered flushing and starting back up with full strength? If you read my journal I recently ran into an issue and had to flush each container with a gallon of RO, and 24 hours later it was night and day difference. I've never heard of growth science.
 
ricky_simples

ricky_simples

In Bloom
Z71banshee said:
Shit! I gave wrong information. I don’t know why I said promix.....I’m using Potters Gold soil. :brainfart:
Click to expand...

lol - no worries. That looks like a solid blend of soil. Could be that you've depleted the nutrition out of the soil and should begin supplementing with nutrients like you said you started doing. I saw you mentioned they're mother plants - how old are they / how long have they been growing in their container?
 
Z71banshee

Z71banshee

In Bloom
ricky_simples said:
lol - no worries. That looks like a solid blend of soil. Could be that you've depleted the nutrition out of the soil and should begin supplementing with nutrients like you said you started doing. I saw you mentioned they're mother plants - how old are they / how long have they been growing in their container?
Click to expand...
They are about 3.5 months old. They have been pruned and root pruned about a month ago, so I’m sure the nutes are gone. Two days ago, I gave them the half feeding of Megacrop with a touch of calmag. They are still ugly (leaves look very deficient) but they are reaching for the light and new growth is looking green. They’re “environment” isn’t ideal right now. My grow room plans have exceeded my budget (who would have thought! Lol), so it’s taken longer than anticipated to get them moms moved.
 
You must log in or register to reply here.
Top Bottom