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best nutrients for growing cannabis in coco

Best Nutrients for Coco Coir – Ironhead Method

The Ironhead method has proven to be one of the best schedules of coco coir nutrients for growing marijuana, for its fast growth rates, no deficiencies and high yields. Based on General Hydroponics Micro, Bloom and Cali-Magic this guide will walk you through the setup required and feeding schedule for the optimal way to grow marijuana in coco coir.

Vegetation (weeks 2-5)

Best nutrients for growing cannabis in coco

Test the pH to prevent nutrient deficiencies

Whenever using liquid nutrients, you will need a way to test pH so your plant roots are able to easily absorb all the nutrients they need. I use a simple General Hydroponics pH test kit. Learn more about managing pH here:​

Poor Nutrients for Coco

At the very least, make sure pH is the first thing you check if you start seeing nutrient problems!

Most of this plant’s leaves are a dark hunter green. Dark leaves mean the nutrient dose is too high and should be reduced. Although not really a problem in the vegetative stage, this excess suppresses bud growth in the flowering stage (buds don’t get as big as they could).

Best Nutrients for Coco

For the easiest coco coir growing, get a smart pot (pot made out of fabric – they work perfectly for growing cannabis and have good drainage).

With coco cannabis nutrients, they’re designed to be most available to your plant when the pH is between 5.5-6.5. If you let the pH get higher or lower than this, you will start getting nutrient deficiencies even if literally everything else is dialed in!

Best nutrients for growing cannabis in coco

It is best to reduce the proportion of nitrogen to phosphorus and potassium during flowering compared to the ratio used during the vegetative stage. It is essential to lower the portion of N at this point. It can reduce bud development and promote vegetative growth instead of generative (also known as flowering) growth.

What Are Mobile and Immobile Nutrients?

If you allow a phosphorus deficiency to run amok, the effects are potentially devastating. Your plants will experience stunted growth, poor yields, and low resin production when they become mature. Make sure you use a fertilizer with a high amount of phosphorus or a bloom fertilizer.

Magnesium (Mobile)

It is fairly unusual for marijuana plants to exhibit a phosphorus deficiency. One of the main reasons involves the pH of the water or growing medium going above 7.0. Your plants need phosphorus for photosynthesis. Phosphorus also helps the release of stored energy in carbohydrates.