J.R. Peters, Inc.

Using these dry nutrients makes storing easier. I like that they're designed to be used with tap water. Combining with Epsom salt was easy. Dissolving was annoying and getting the EC right a bit of a process. Results seemed good, though. The company seems responsive and to care about the customer.

Love this stuff, love long fan boy!

I didn't actually use this for this grow as I decided I wanted to do a completely nutrient-free and maintenance free outdoor grow. I usually use this line for all my outdoor sparingly and it has never let me down.

First run using, absolutely love it, new standard!

When growing with salts I use bloom in transition and early flower. In soil I use part a only for late flower only.

I love the consistency using these nutrients and haven't ran into any issues the whole grow

Very easy to use and never caused an issue during the grow.

The grow did go great using only this in the same amounts for the entire grow. I'm trialing the GH Flora trio instead of this to see if there's much of a difference

Good idea to use these in the seedling stage to give the seedling a big push. I would not use it before 2 weeks after germination--its a little strong. I also would not recommend anytime after prebloom. I only use it as a one shot deal after the first true leaves have formed and only to boost vegetative growth.

I have been using this for YEARS. I use it very sparingly for my outdoor garden only, and it has always worked great. Bonus, you can't get much cheaper.

Great and easy to use. I seem to be getting purple flowers with my last two grows.

I use the same fertilizer from seedling to 3-4 weeks before harvest, just different concentrations.

It really is easy as 3-2-1, would use this formula again.

Easy to follow I drop the 2 from 2.6 closer to 2 during flower.

Excellent product have been using it for two years multiple grows has never let me down, minimum issues, if there is one it's usually do to user error. Love this product! 🔥

I love jacks - so happy we switch to dry salts. It's much easier than that GH floranova garbage we used before it.

One shot deal during early veg (3 weeks) to give seedlings a quick shot in the arm.

It was okay, but it is not a complete formula and lacks calcium and mg which need to be supplemented

Excellent dry nutrient for city growers.

I was turned on to Jack's by a forum post on a popular cannabis forum. After doing my research on it, I decided to start using it. I love this stuff, and I'm never turning back! You know EXACTLY what you are feeding your plants, and the cost savings compared to liquid fertilizers is ENORMOUS.