Fantastic as always. So much useful information, even for someone like me who has been growing for over 12 years. Thank you, Mr. Smith.
Rated 5 out of 5



I recently completed the Complete Harley Smith Master Grower Video Library course on cannabis cultivation and I have to say, it was a fantastic experience. The course covers everything from the basics of plant biology to advanced techniques for optimizing yields and potency. Harley Smith is an excellent instructor and his passion for the subject matter really shines through in his engaging lectures and detailed explanations. One of the things I appreciated most about this course was its comprehensive nature. It left no stone unturned and covered every aspect of cannabis cultivation in great detail. Whether you're a complete beginner or an experienced grower looking to take your skills to the next level, you'll find plenty of valuable insights and techniques in this course. Overall, I would highly recommend the Complete Harley Smith Master Grower Video Library to anyone interested in cultivating cannabis. It's a fantastic resource that will help you grow high-quality, potent plants with confidence.
Rated 5 out of 5



Incredible amount of Applicable knowledge gained.
Rated 5 out of 5



Just wanted to update you on my progress.  I combined your booster recipes you shared with my standard nutrient and I'm seeing some serious results despite setbacks along the way! Just wanted to thank you again for the wisdom you imparted Bc it really helped kickstart a lot of learning and troubleshooting for me and I feel like I'm super ready for this next auto run!
Rated 5 out of 5



Its like learning from your grandpa,the best and most loving class out there! Amazing is an understatement! Lots of love Aditya
Rated 5 out of 5

~Aditya Jain


I'll probably watching this 10 times each just to absorb the amount of information. I do wish it was 99% lecture. The best videos are the propagating and cloning. The visual guides are easier to absorb. I'd like to see a class on identifying what the plant needs so we know how to "spoon feed". Thanks Harley!
Rated 5 out of 5

~Andy Chapman


It's also nice to finally be on board with professionals, will look into "street science" in the future, that's sweet. I want to thank you Mark for taking the time and giving the attention needed for my order even tho I'm not a big commercial facility. I've been a licensed medical grower for 3 years now since I was diagnosed with perianal abscess, 11 surgeries since 2017. That's what fueled me to reach out to someone like you. I'm precisely following the all in one feeding schedule hoping for great results! Pleasure doing business with you. Happy Growing!



I’m a medical cannabis patient that is on long term disability. For the last 3 years I’ve been dedicated trying so many different products and experiments to get the best medical cannabis I can possibly achieve, as well as answering questions that I had for myself. I have to say that your Grow & Bloom beneficial bacteria & microbes is an AMAZING product. I had soil problems in the past such as pyth and once I starting using this product I’ve never had a problem again. But it doesn’t stop there. I did a few side by side comparisons and noticed a big difference. The side with the microbes was more vigorous and looked that much better than the side without. The final result was amazing too. The side with the microbes tasted so much better and was more potent than the side without. Every grower using soil/soiless should be using this product

~Patrick H


I've been growing for over a decade using different brands of liquid fertilizer and their feeding charts but never got the results I wanted. Would also have to tweak the feeding chart to feed at a lower strength as my plants would almost always get burnt.

I was introduced to NPK Industries "RAW" nutrients by a friend that had recently switched to it and wouldn't stop talking about how easy it was to use and how good the results were. So being the person I am always looking to learn and improve I had to give these nutrients a try.

I started with just some of the products, I think it was just the Grow, Bloom, B-Vital and Calcium/Mag but by the time my veg was over I was so impressed I ordered the rest of the line and don't think I would ever stop using it.

I called my friend and thanked him, it was definitely a game changer, just like he said it is very easy to use. I follow their feed chart and I don't have to increase or decrease anything, I literally use what's recommended on the chart.

The Soluble Nutrients also means I get more for my money as I'm not paying for water like I would with some of the other brands and to top it off the great customer service is second to none. I placed an order in the height of the pandemic and Mark did everything in his power to keep me informed every step of the way ensuring that my experience was as smooth and stress free as possible.

I'll be a customer for life!!!

-Cheyne Harris



I own a hydroponics store in New Jersey and have taken his classes twice now, as well as my employees. It's great information for beginner or advanced growers in any medium to build on foundational knowledge of growing requirements and proper use of nutrients. Thanks Harley for sharing your experience in the industry!

-Master Growers Customer



Very helpful and informative. This course is wonderful and informative. So much to learn and apply to your garden!

-Master Growers Customer


Thank you so much for your help, Mark's kindness, generosity and willingness to help, is what this world needs more of. I have always been a LOYAL consumer, to the company that respects and treats customers with dignity, honesty and has an amazing product. I told him i was switching from Diablo nutes to NPK, im so floored and blown away by your company's ethics and incredible product, you now have a customer for life. Thanks, greatly appreciated.

-TJ Mills


Best courses I've found. Rated 5 out of 5.Harley Smith Master Growers Video Library Review.

Jeremy L.


I have contacted NPK industries now at least 10 times now, on separate occasions, with questions pertaining to different growing mediums.....

The staff there, specifically Leland, has demonstrated a great wealth of horticultural knowledge.   I have never been let down by one of his/their answers.   Even using their products in conjunction with my baseline, they were more than willing to help me figure out the most optimum approach....

They have always been available during business hours online, to chat, and have always responded within a few minutes! I have even spoken to Leland at lengths, via telephone, in order to more clearly communicate and work together as a team.  
I have been in the horticultural industry for the last 2 decades and very much appreciate talking to a person with a vast knowledge and strong background in the area...

You are the best Leland!!

Michael V.


I'm 51 years old and grew up farming watermelons and tomatoes, along with other vegetables and all types of flowers, plants, shrubs, and trees. You name it and I've grown it. I had several lower back operations and would not take opiates for pain and then thyroid cancer. I started growing my own medicine and being a life long gardener I knew I had the basics down. So I started doing my research buying fertilizers, supplements, and a few other snake oil products that promised this or that. I"ve used every big name fertilizer that exists and a few off brands. Jacks 3, 2, 1, Athena, Advanced Nutrients, General Hydroponics, Humbolts Secret, the other Humbolt Secret, House and Gardens, Cana, Megacrop 1 and 2, and others. One day I saw RAW NPK on Amazon and how easily it dissolved and it really impressed me. So I started researching NPK Industries and liked what I saw and purchased 2oz packages of Nitrogen, Potassium, and Phosphorus and started a grow of some autoflowers. I noticed something different hours after feeding, I noticed the plants were perkier, greener, growing faster than my past grows. I followed RAW's feeding schedule to the letter because the NPK values are so high and I didn't want to burn my plants. Fast forward to the end and these 4 plants with just nitrogen potassium and phosphorus yielded over 4 pounds of cured flower. I was thrilled and immediately order RAW NPK Grow, Bloom, grow microbes, bloom microbes, humic acid, full up, kelp, Vitamin B, Calmag, cane molasses, enzymes, OmniA, Aminos and a PPM meter. I planted a new grow of 8 plants and printed out the RAW NPK recipe boosters along with the Grow and Bloom feeding schedule and got to work. I would feed every 6th day and use my PPM meter to adjust my mix 200ppm every feed until I saw slight stress. I would then dial it back 200 and know I was dialed in. What happened next was almost like magic, each strain has a different PPM and getting each one dialed in with these nutrients was an explosion of growth and weight. The boosters were key I think. The Growth booster, nutrient uptake booster, pre flower booster mid flower booster, and the others applied at the right time between feedings (On a watering day) really made the plants literally leap. I had everyone asking what nutrients and lights I was using and I would always say RAW NPK and explain my methods. I then started winning grow-offs on social media and gained a nice following on reddit and instagram. I  Read a lot of threads of and look at photos of people showing off their plants and buds and mine are always bigger. Thats not boasting, thats facts. My sativa buds looked like huge fat indica buds, and my indica buds looked like an oil can from back in the day. I couldn't put both hands around these buds and by week 5 or 6 I was having to stake the branches up because the buds were breaking the limbs. I had only seen stuff like this online and in magazines, and mine were better than those. RAW NPK works, you only need to follow the feeding charts and booster recipes and you'll have great success and way way way fewer problems. You'll be surprised how easy it is if you just follow the directions to the letter. You'll notice its cheaper in the long run, a lot cheaper. You're using less nutrients, getting better yields, and working less, with fewer problems. Whats not to like?  If you are a new grower just follow the directions to the letter and you more experienced growers can up your game  adjusting your PPM/EC pushing your plants a little more for getting them to optimal performance. One plant may be 2600 ppm and another strain may be 1400 ppm, but once you're dialed in. Just sit back and watch them do their magic..With 5 gallon containers I recommend 1 liter run off watering and feeding, 3 gallon 1/2 liter to keep any residual off your roots..RAW Products dissolve 100% minus the microbes, but I put those on dry around the plant and water them in anyway. I use well water too and its around 45 degrees all the time and it still dissolves 100%. You hydroponic growers would do well switching to RAW NPK as well and use their Hydro nutrients mix. I know there's no such thing as magic, but RAW NPK is as close as you're gonna get to seeing magic. I wasn't paid for this review or reimbursed. This is just my experience with this product. Remember to work smarter, not harder and RAW is a good start...

James Ronnie Black III