The Grow Awards 2025 🏆
Chat
Recommended

 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.

J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.J.R. Peters, Inc.
Show more

Awards Show All Diaries

Purple Ghost Candy
24 weeks
Purple Ghost Candyresimax
Purple Ghost Candy
2 years ago · 135 comments
White Widow, first grow, 2x2
22 weeks
White Widow, first grow, 2x2esotaro
White Widow (fem)
3 years ago · 16 comments
Seedsman: Sunset Fem 4/20 Bundle
17 weeks
Seedsman: Sunset Fem 4/20 BundleForbiddenGrowers
Seedsman - Sunset Fem
3 years ago · 25 comments
advice

Popular Diaries Show All Diaries

Purple Ghost Candy
24 weeks
Purple Ghost Candyresimax
Purple Ghost Candy
2 years ago · 135 comments
Mataro Blue
19 weeks
Mataro Blueresimax
Mataro Blue
a year ago · 65 comments
Kiss Trifecta
19 weeks
Kiss Trifectaresimax
Kiss
2 years ago · 77 comments
Malasana Cookies
18 weeks
Malasana CookiesCheeba_Inu
Malasana Cookies
3 years ago · 31 comments
Ninja Fruit + Alien Rift
20 weeks
Ninja Fruit + Alien RiftBountykiller420
+1 strain
7 years ago · 107 comments
RQS Green Gelato QB288-V2 cob
19 weeks
RQS Green Gelato QB288-V2 cob happytrees
Green Gelato
5 years ago · 51 comments
Purple platinum kush
15 weeks
Purple platinum kushsimps
Purple Kush
8 years ago · 68 comments
Chemdawg Outdoor
10 weeks
Chemdawg Outdoor BigNate89
Chemdawg
6 years ago · 55 comments
Medusa F1
9 weeks
Medusa F1resimax
Medusa F1
2 years ago · 53 comments
Seedsman: Sunset Fem 4/20 Bundle
17 weeks
Seedsman: Sunset Fem 4/20 BundleForbiddenGrowers
Seedsman - Sunset Fem
3 years ago · 25 comments

New Diaries Show All Diaries

Bubble Gum Vienna Clones
6 weeks
Bubble Gum Vienna ClonesLonnert
Bubble Gum
2 days ago · 4 comments
Gorilla Cookies auto 1/26/25
8 weeks
Gorilla Cookies auto 1/26/25O1234567891O
Gorilla Cookies Auto
5 days ago · 3 comments
RQS Mixed Auto Grow 1
12 weeks
RQS Mixed Auto Grow 1Madd_Rez
+3 strains
2 days ago · 12 comments
Illuminati OG
7 weeks
Illuminati OGMadd_Rez
Illuminati OG
3 months ago · 6 comments
Irvine Mixed Fem Grow 2
12 weeks
Irvine Mixed Fem Grow 2Madd_Rez
+3 strains
4 days ago · 2 comments
24/25 Grow 3.0
12 weeks
24/25 Grow 3.0kingsymba
Strawberry Banana Auto
3 months ago · 1 comment
advice

Latest reviews Show All reviews

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.
Show more
2 months 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!
Show more
3 months ago
CandogApprentice
All I use start to finish
Show more
3 months ago
greenAFMaster
Love jacks
Show more
5 months ago
greenAFMaster
Love jacks
Show more
5 months ago
advice
Login

2 comments
Sort by
popularity
popularity
newest
oldest
Sheepsblood
Sheepsbloodcommented7 years 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
Homegrown365commented7 years 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.