The Importance of Diversity in Feeding & Fertilizing Cannabis

As we all know, cannabis is a weed. It’s a very versatile, adaptive plant species that could grow in the cracks of pavement in the sidewalk. One of the amazing things about our sacred plant is the more you nurture it, the more it can and will give back to you.

I see a lot of good cannabis, but not so much memorable, amazing cannabis. I would like to see more. One reason I believe I see this is many talented growers stick to what they know and/or what works for them. While it’s true that many growers improve their methods over time through research and trial and error, I still think some lack diversity in what they give their plants and miss out on really pushing the limits from good to great.

For some, this is due to the drop in market value of their crop vs. the rising cost of production (e.g. soil, nutrients, amendments, etc.). Of course, as with any business, economics is a key to being successful. Efficiency with cost of production could make or break some growers over the next several years as the wholesale market price continues to decline.

A Grower’s Goals

If you want to compete in the future, you must stand out and have something special to offer. Whether a regulated medical or recreational California market or the black market that has sustained the local culture in the Emerald Triangle for decades, we will need to do better. Better pest management, better quality, and better yield. Overall, better efficiency is needed.

One of the best ways to push cannabis to its limits of potential quality and quantity is diversity. Let’s talk about it.

First, what are the goals of a grower? They should be (in no particular order) to achieve the best:

  • Yield
  • Density
  • Smell
  • Flavor
  • Potency
  • Cleanliness (mold/insect/mildew/contaminant free)
  • Cost and labor efficiency


A Few Common Feeding Approaches

Many experienced growers tend to go in one direction or another when it comes to feeding and plant nutrition. Some use a diverse soil mix packed with amendments rich with macro/micronutrients, and beneficial microbial life designed to break down over time and allow for minimal additional feeding over the course of a long grow season.

Others prefer a lighter, cheaper soil and focus on bottled, commercially available nutrients and additives for feeding regimens.

Many use simple, cost effective organic aerated compost/worm casting teas. Packed with beneficial microbial life that colonizes the soil and the plant’s root zone, these teas assist with nutrient availability and overall plant health.

Then there is the advantage of foliar spray feedings, which can be done with different nutrient products or aerated teas.

Lastly, there is the option to use an organic amendment top dressing acting as a slow release fertilizer and reinforcement of beneficial microbes.

Do it Better With a 5-Point Attack

Why not go with a balance of all these techniques? By doing so you’ll be surprised how you can cut back certain costs and your quality and yield will impress you, even if you’ve been doing what works for you for years and you’re happy with your current results.

Think of it as a 5-point attack:

  1. Soil
  2. Liquid Nutrients
  3. Aerated Compost Teas (ACT)
  4. Foliar Spray Feeds
  5. Top Dressing

By using a balance of these you will use less of each than if you were utilizing just one or two, ultimately spending less on each, and getting the well rounded benefit of diversity. You’ll be spending responsibly and seeing increased quality and yield — you can’t go wrong.

Let’s go over each.

1. Soil

You can cut back on the use of amendments in your soil mix. Many times a buildup of nutrients in a hot soil mix will result in a harsher burn impacting flavor and taste even after a long season and a good cure. Focus less on guano and manure in your soil and prioritize quality worm castings and compost. Use some kelp, rock dusts, and gypsum. It’s important to keep your soil mix diverse with ingredients, just cut back on how much of each you normally use.

2. Liquid Nutrients

With bottled nutrients and additives you can now use them less frequently. Try feeding every 10–14 days instead of every 5–7 days. Half the use is half the cost. You can depend on your other feeding sources to compensate for the less frequent feedings.

3. Aerated Compost Tea

Compost teas are cheap and effective. Brew up compost, worm castings, some kelp, maybe some rock dust minerals, and a food source like molasses for the microbes. You can apply teas every 7–14 days for minimal cost, although some growers achieve great results using them once a month. The tea will aid the functionality of your soil. Microbes will break down nutrients making them more readily available and will also protect your plants from viruses and pathogens.

4. Foliar Sprays

Foliar sprays are extremely effective and I’m surprised many growers don’t apply them more. While they do require some extra work hours, they can make a huge difference in a plant’s health and growth rate. You can use commercially available nutrient and additive products or spray with an aerated compost tea that was also brewed for a root drench.

When sprayed on a leaf surface, microbes in the tea will colonize it and compete for surface space with pests such as powdery mildew fungal spores and botrytis (bud mold). Be sure to use a wetting agent so the spray will remain on the leaves and not drip off. I like to use a little organic liquid dish soap or yucca extract.

5. Top Dressing

Top dressing is a great boost for your plants if the timing and ingredients are done correctly. Sometimes your plants’ growth rates may be slowing down in between feeding or in transitional periods. A well-timed and measured top dress application every three weeks or so of worm castings, compost, kelp, guano, rock dust, etc., will benefit your soil and plants over a long season.

Think of it as soil maintenance or refueling. Gently rub or scratch your top dress ingredients into the top layer of soil, being careful to avoid damaging fragile roots or allowing the top dress to end up on or too close to the plant stock to prevent problems. Make sure to water it in well by hand at least once a week. If there is a build up of top dressing on the surface of the soil late in the season you can remove it to prevent it from affecting the flavor or harshness of your flowers when smoked.


By diversifying your approach to feeding and plant nutrition you will see your plants respond to the advantages you’re providing them with. We all want to increase our quality and production while remaining cost and labor efficient. This is a great way to do it. Your patients, friends, family, buyers, lungs, taste buds, and brain will thank you.

Let’s all grow more and better cannabis!

— Ganja D


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