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 J.R. Peters, Inc is a family business. The company was founded in 1997 and based on 70 years experiens in the growing field. Bob Peters started his Horticultural Services Co in 1947. He tested soil for greenhouse growers and made recommendations on how to produce the best crops. His son Jack Peters is advancing the tradition of Peter’s family quality products and services. 

J.R. Peters, Inc has its own in-house testing laboratory that has been providing outstanding analytical services to the horticulture industry for over 70 years. Professional growers, horticultural products manufacturers, and university researchers throughout the world trust us to supply accurate and timely services.

J.R. Peters, Inc also produces specialty fertilizer products for other companies that demonstartes high level of production and reliability of this company.

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Latest reviews Show All reviews

I probably used no more than a cup and a half of fertilizer. No bloom boosters or special/other fertilzers. 25 pound bag cost about 60 USD with shipping. 400 ounces/bag 15 cents/ounce 1.5 cups = 14.5 ounces x .15 = 2.17 worth of fertilizer. No joke! Don't waste your money on special/expensive fertilizer!
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2mo ago
l0rcasNewbie
The Jack’s nutrient line made feeding easier due to its simplicity. With fewer products to mix, it was quick to prepare, and the scoopable measurements were far more convenient than syringes. This streamlined the process and made feeding more manageable, especially during the recovery phase. However, I can’t fully assess the impact of Jack’s nutrients on plant health, as I switched to them when the plant was already stressed. While they didn’t seem to improve things drastically, the plant didn’t suffer from them either, so they appear to be effective without being harmful.
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4mo ago
Madd_RezApprentice
Been using Jacks for almost a year. Almost from the the first few weeks, I knew I found what worked well for my tap water and environment. Finally got results I have been expecting, won't use any other base!
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4mo ago
CandogApprentice
All I use start to finish
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5mo ago
greenAFMaster
Love jacks
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6mo ago
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Sheepsblood
Sheepsbloodcommented7y ago
I use 3.69g/gal of 5-12-26 2.45g/gal of 15-0-0 Plus I add in 220ml of Cal-Mag (my well water is like 70ppm so I need that CalMag) I don’t change from beginning to end. Same strength all the way through. My only additive is Terpenez and my stuff gets quite stinky. No cover up in a bag in a bag in a bag. In my indoor hydroponic ebb and gro setup. I do this under 6-315watt CMH lights and yield 5 lbs nearly every time. Airsealed room with 12k worth of mini-split AC and CO2 enriched. I run two rooms like this.
Homegrown365
Homegrown365commented7y ago
Greetings All: First of all, this nutrient is cost effective aka cheap. Previously, I was a House n Garden user. Loved my results. Costs...phew!! Came across JR Peters while following other growers (mentors DIY COBs) I saw their results. Started using JR Peters, Jacks 321 formula in coco. Results totally floored me. Another plus to me is that I use Jacks 321 from cutting thru flowering, I water/feed all from the same rez. No measuring amounts for early veg, etc. I prep the rez and feed all from there. Have yet to see any adverse effects. As an additive, I've begun using Mammoth P. Hope this helps.