Stop buying bottled nutes, mix your own from raw salts

Been mixing my own base nutrients for about four years now and the cost difference is genuinely absurd. A 25 lb bag of calcium nitrate runs around $20-25 online. That same calcium in bottled form, priced out per gram, costs you 40 to 60 times more. The markup on commercial nutrient lines is mostly water and branding. For a basic two-part you only need a handful of salts. My veg formula is built around calcium nitrate, potassium nitrate, monopotassium phosphate, magnesium sulfate, and a micronutrient blend like Hydro-Gardens CHB or similar. That covers your 3-1-2 NPK ratio in veg without much fuss. Flower just shifts the ratios, less calcium nitrate, more mono potassium phosphate, add some potassium sulfate. The raw materials cost me roughly $0.03 to $0.06 per gallon mixed at full strength. I ran a bottle of a popular two-part recently just to compare and it came out to around $0.90 per gallon at the same EC. Same plants, same tent, same results. The savings over a full season are real money. The learning curve is maybe two weekends of reading. Grab the Handcrafted cannabis nutrients thread archives or look up the Lucas formula as a starting point. Once you understand what each salt actually does, buying bottled nutrients feels like paying for a restaurant to boil your pasta.

3 comments

3 Comments

Experienced16d ago

The cost math is solid and i won't argue it. But for guys growing for terpene expression specifically, this is where i'd pump the brakes a little. The chelation method matters. Synthetic chelates like EDTA vs natural chelates like EDDHA can affect iron uptake differently depending on pH swings, and i've personally noticed some of my more terp-forward phenos get a little flat when micronutrient delivery gets inconsistent. Could be coincidence, could be real, but it's made me cautious. The other thing nobody mentions is silica. A lot of people mixing raw salts skip it or treat it like an afterthought. Potassium silicate has made a noticeable difference in resin density for me on a few phenos i was hunting this past run. Raw salts are great for cost. Just don't assume the results are identical to dialed in bottled lines until you've run a few cycles and really know your baseline. The savings are real but so is the learning tax if you get something off.

Experienced16d ago

The cost argument is legit but i want to push back slightly on the "two weekends of reading" thing. That might be true for hydro in a stable system, but if you're running organic amended soil or even coco with variable water sources, the learning curve stretches way past two weekends. Hardness of your tap water alone can throw off your calcium and mag ratios enough that your "dialed" formula isn't actually what you think it is. I run autos in a 3x3, perpetual harvest, so i'm mixing small batches constantly. The raw salt approach works fine for me now but my first three months were genuinely humbling. pH interactions between salts if you mix them wrong, precipitation in the res, calculating for actual ppm vs label claims on cheaper salt bags. None of it is impossible but calling it a minor learning curve feels a bit optimistic to me. Still worth doing. Just go in knowing it might take a full grow cycle before you're actually confident in what you're feeding, not two weekends.

Expert Grower16d ago

the water chemistry point is real, i'll give that. but i think people overcomplicate the troubleshooting because they're chasing perfect numbers from day one. learn to read the plant first, fix the math second.