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best nutrient ratio for growing weed

Best nutrient ratio for growing weed

There used to be a ton of organic soil nutrients in bottles (like the now-discontinued GO Box) but many options have disappeared as growers switch to using amended compost for their organic nutrient needs. Why? The organic nutrients in bottles get similar results to mineral nutrients. The biggest difference in organic growing seems to come from using actual compost and/or amended soil.

If you’ve decided to start growing cannabis for the first time, trying to figure out the best nutrients for your setup can be very confusing. There are many nutrient companies, and each company creates multiple lines of nutrients and supplements for different purposes.

For the best results, your cannabis needs the following nutrient ratios…

Checking the pH will make a huge difference to your grow by keeping plants vibrant and healthy. It only takes a few minutes each time you water your plants! If you get a digital pH pen, it only takes seconds to test your pH!

What’s the Best NPK Ratio for Cannabis Nutrients?

Canna Coco

Recommended Organic Nutrients

Very concentrated, less is more. “Grow Big” & “Tiger Bloom” provide most of the major nutrients your cannabis needs, while “Big Bloom” has many micronutrients and beneficial compounds that help nutrient uptake and root health. This trio works extremely well by itself, just follow the feeding schedule (here’s a PDF, here’s a JPG) from Fox Farms at half-strength to start.

Examples of Good Can nabis Nutrients

This combo is a crowd favorite – many coco coir growers write in to tell us this is their favorite cannabis nutrient for growing in coco coir. Get a custom nutrient schedule from Canna or use this pre-made one [JPG].

Fox Farm Nutrient Trio

These numbers vary between products, but they’re always placed in the same order. It’s one of the most important equations when it comes to growing cannabis plants; the amount of nitrogen (N), phosphorus (P) and potassium (K) that is present in the fertilizer product that is being used. In some places, like Australia, often the letter S is added – referring to Sulfur.

Why is NPK Important?

Some strains, specifically indica strains, tend to respond better to higher doses of fertilizer, while sativas usually correspond to fewer nutrients. Hybrids and auto-flowering strains occupy the middle ground – some lead toward a preference for higher or lighter doses.

Nitrogen, Phosphorus, and Potassium Sources

In fact, if some ingredients used to make fertilizers are used incorrectly, there can be a negative reaction. This is why it’s very important to ensure that you know what you’re doing if you opt to go down this route. Producing homemade fertilizers also requires precise measuring to ensure that the mixture has the right concentration of NPK.