If you are using a pure water source (reverse osmosis, distilled water, or rainwater) we recommend the 3-2-1 program or the 12-4-16 program. If you are using any other water source (well water, municipal water, etc.), send a water sample to the JR Peters Laboratory for a full nutritional analysis. Once you receive your results via email, you can send them to our Technical Specialists at jackstech@jrpeters.com to get dialed in!

Click on this link JR Peters Laboratory – here you can find a link to instructions on how to send your samples in.

Jack’s works wonders in recirculating and drain-to-waste hydroponic systems (DWC & NFT), aeroponics, rockwool, coco, soilless potting mix, and field soil.

We recommend feeding every time you water your plants as a CLF (Continuous Liquid Feed Program) which provides a continuous low rate of nutrients throughout the grow.

We recommend waiting until the first two inches of soil are “paper bag brown” dry, before watering again. And of course, feed every time you water!

A lot of times we find that professional hydroponic growers value the option to be able to manipulate their nutritional inputs when things change. Growers become very attune to their growing environment and how it can affect plant growth rate. Changes in the environment can be due to many things, one of the most common is the light level either outside (time of year) or indoor light schedule. Light levels at either extreme can influence the plants transpiration rate. When there are lower light levels, for example, like during the 4th Nor’easter storm of the winter, the plants rate of transpiration slows and this goes hand in hand with reduced nutrient uptake. A grower using a A/B injection system can manipulate the ratio of nutrients very easily. In this case they could adjust the Part B injection rate while keeping the Part A concentration steady. This will give the plants a needed 30-40 ppm boost of Ca from the Part B while keeping the micronutrient concentration steady with a consistent Part A injection.

We recommend using the 15-6-17 Clone formula on clones or young seedlings for the first 2-3 weeks, until they have 3-4 sets of true leaves. After those 2-3 weeks are up, begin using a base formula (3-2-1, 12-4-16, 15-5-20, or 18-8-23) and watch those babies grow!

The 10-30-20 Bloom was designed to be used for 1-2 weeks. This formula will pump Phosphorus into your plant, creating a smooth transition into flower. Side note: 10-30-20 Bloom does not have Calcium in it, so after those 1-2 weeks are up – switch back to your base formula (321, 12-4-16, 15-5-20) to give back the calcium that cannabis craves!

The 7-15-30 Finish is loaded with potassium which goes right to the developing flowers resulting in super dense and healthy buds!! Use the 7-15-30 Finish for the last 1-2 weeks before flush/harvest and help fatten those buds up!

Through scientific studies and working with our cannabis trial growers, we found out that cannabis still likes a good amount of Nitrogen during flower! Plus, our grow formulas (3-2-1, 12-4-16, 15-5-20, 18-8-23) still have a solid amount of P and K, which is essential for bud development.

We got you covered on the essential nutrients! No need for supplements such as Cal-Mag or PK boosters. Some growers are adding Microbials and Silica with great results, while other growers only using Jack’s have great results too!

We recommend flushing your plants if the salts are building up in the rootzone (high runoff EC/ppm) to help avoid salt stress. However, flushing too often may lower the EC/ppm of the rootzone too low and result in deficiencies over time.

Since you are using tap or well water, send a water sample into the JR Peters Laboratory for a full nutritional analysis! This way, we can see everything in your water (nutrient wise) and get you dialed in right off the bat! Once you receive your results via email, you can send them to our Technical Specialists at jackstech@jrpeters.com to get dialed in! if you do not want to go the water test route, use the 321 program! This program provides growers with the most flexibility because it is a 2-bag system (Part A 5-12-26 & Part B 15-0-0).

Yes, you can but it is not the best way to feed your plants when using Jack’s! There are tiny pores and stomata on the leaves that only allow so many nutrients in. Foliar feeding is a fantastic way to help treat a nutrient deficiency quickly, but you will get the most out of Jack’s when you apply our fertilizers directly to the rootzone as a continuous Liquid Feed (CLF).

The main difference is that Bloom is part of our Nutrients line and has a boosted micronutrient package perfect for controlled environments, while Blossom Booster was designed for use in traditional horticulture. Another more obvious difference is that Bloom is a finer product while Blossom Booster has a few different particle sizes.

Currently we do not have any samples or coupons, however, our KITS are a great way to try a specific growing program, like City Limits, Pure & Simple or Jack's 3-2-1.

Currently we do not ship directly to Canada, but that doesn't mean you can't find us there! We're excited to have distribution partners in Canada that can help ou find the Jack's Nutrients that you're looking for.

Eddi's Wholesale is one of those distribution partners. They can help you find stores in your local area already carrying Jack's. Here is the link to locate the stores in your area based on your postal code: https://www.eddiswholesale.com/hydro-store-locator

Unfortutnely, we do not have any distribution outside of the US & Canada. Keep an eye out on our here and our Instagram page @jacksnutrients for updates. If you're an international distributor in Europe or elsewhere interested in carrying Jack's, let's have a conversation. Email mday@jrpeters.com to talk!