Robert Bergman

August 29, 2019

One of the best ways to ensure a bountiful marijuana harvest is to use earthworm castings on the soil. This natural material is the by-product of the food digested by the worms. As such, it is purely organic and extremely rich in both the main nutrients and trace minerals that are essential to the plants.

Interestingly, the benefits of using worm castings are not only limited to nutrients. It has several other surprising advantages, making it deserve to earn the title of super plant food. For this reason, it is the most popular fertilizer that many big city millennials use to nourish their plants.

While many growers commonly associate composting with hard work, using this method is relatively easy. Basically, all we need is a good environment for the worms and plenty of food supply to work their magic. Once we apply it to our crop, expect to see it grow healthier and produce richer buds.

To get started in using worm castings, it is best to know the basics about it. Hence, this article will cover its benefits, production, and usage. Because of its tremendous positive effects on the plants, learning about it can be extremely valuable to the cannabis growers.

Earthworm Castings in Growing Marijuana:

What We Need to Know About Worm Castings

Again, the best way to supercharge the soil is to use worm castings. But how do we get started with this method? For interested growers, this section will provide all the necessary information to start using it effectively in the garden. But first, let’s take a quick look at its composition and benefits.

1. What is it?
As mentioned, worm castings are the excrement s of worms from digesting various food scraps. Somehow, through their digestion process, they produce this material that is loaded with rich nutrients for the soil.

Tip: Go get my Free Grow Bible to know more about Earthworm Castings

1.1 Worm Castings vs Vermicomposts

WormCasting in Growing
Worm Castings vs Vermicomposts – Image powered by devonport.tas.gov.au

Worm castings slightly differ with vermicomposts when it comes to composition. While the former is made purely of worm feces, the latter is a mix of the castings and other materials in the compost. Both have the same basic ingredient and are often combined with each other. Thus, many growers use these terms interchangeably.

1.2 What kind of worms can we use?

Red Worms
Red Worms – Image powered by saferbrand.com

There are specific earthworms that growers use for this purpose. The two main types are the Lubricus rubellis and the Eisenia foetida which are also the ones we use as fish baits. Casually, they are known as the red worms, red wrigglers, tiger worms, and the manure worms.

2. What are its benefits?
Aside from being totally chemical-free and inexpensive, using worm castings can make huge improvements to the garden. In addition, they are readily available and are easy to make. So, what more do we need? To truly appreciate their magic, let’s examine how they are beneficial to the crop.

2.1 Aerate the Soil

Aerate the Soil
Aerate the Soil – Image powered by wormsetc.com

While most gardeners keep their worms in a container, some are more practical and just let them loose in the garden. This allows the worms to perform their most obvious functions which is to tunnel through the soil and introduce oxygen in the process. As a result, the roots get enough space to absorb more water and nutrients.

2.2 Environment-friendly

Environment-friendly – Image powered by maxpull-tlu7l6lqiu.stackpathdns.com

Aside from being nature’s decomposers, worms also help households reduce their waste by recycling their kitchen scraps. This significantly reduces landfills while enriching the soil and produce bountiful harvests. Add to that, using castings eliminates the need to use harmful chemicals in the garden.

2.3 Get Rid of Harmful Microorganisms

Get Rid of Harmful Microorganisms
Get Rid of Harmful Microorganisms Image powered by marijuanagrowershq.com

Worm castings release substances in the humus that eliminates toxic fungi and bacteria. In effect, they fight off diseases that could possibly weaken the plants and affect our yield. Moreover, they also introduce good microorganisms that help make the soil richer and the plants healthier.

TIP: Interested with seeds? Visit my marijuana seed shop

2.4 Make the Soil More Absorbent

Make the Soil More Absorbent
Make the Soil More Absorbent – Image powered by leafly.com

The castings can make the soil absorb moisture more easily. As a result, the soil gets all the water that it needs, keeping the plants well-hydrated and at no risk from completely drying out.

2.5 Stabilize the pH of the Soil

Stabilize the pH of the Soil
Stabilize the pH of the Soil – Image powered by amazon.com

The soil needs to have a balanced pH to absorb the essential minerals. When we apply the worm castings, this immediately corrects any imbalances in the pH level. Hence, for many growers, this is the best remedy and preventive measure for nutrient problems.

2.6 Teeming with Nutrients

Teeming with Nutrients
Teeming with Nutrients – Image powered by maxpull-tlu7l6lqiu.stackpathdns.com

Compared to the ordinary potting mix, castings have ten times more nutrients. In fact, they contain over 60 micronutrients and other essential elements including nitrogen, phosphates, and calcium. Even better is that unlike commercial fertilizers, they are released slowly in the soil, preventing any nutrient burn or mineral buildup.

2.7 Remove Toxins in the Soil

Remove Toxins in the Soil
Remove Toxins in the Soil – Image powered by economist.com

Sometimes, there are heavy metals and other toxic matter in the soil. Impressively, worm castings remove these dangerous wastes, leaving the soil safe and suitable for the plants to grow in. This is especially useful when growing marijuana in reclaimed landfills or other contaminated areas.

Tip: Check out my free Grow Bible to know how Earthworm Castings helps your soil in growing marijuana

2.8 Repel Pests

Repel Pests
Repel Pests – Image powered by ilovegrowingmarijuana.com

Aside from enriching the quality of the soil, worm castings also protect the plants from pest damage. Studies found that applying them around the plant promotes the release of chemicals that are offensive to insects. In effect, we control pest problemswithout resorting to chemicals.

3. How do we make it?
While some growers prefer to buy the castings from a local garden supply center, others like to make their own. The great thing about this method is that we can practice it anywhere. Whether at home or in the office, anyone can start making worm castings in three easy steps with the help of a few simple things.

Step 1: Select a Container

Select a Container
Select a Container – Image powered by growingwildceeds.wordpress.com

Before getting the worms, prepare a suitably-sized bin for the desired amount of castings. Nowadays, there are so many types of commercial worm containers that are available online. They are designed for home use, so they are very easy to manage.

Step 2: Obtain Earthworms

Obtain Earthworms
Obtain Earthworms – Image powered by wormfarmfacts.com

Now that we have a container, it’s time to get the worms. Most growers prefer to acquire them the easy way and purchase them at the local garden store or online. Others like to comb the soil for red wrigglers themselves. But remember that we need at least a thousand of worms if we want to produce a decent amount of castings.

Step 3: Provide the Basic Needs

Provide the Basic Needs
Provide the Basic Needs – Image powered by redwormcomposting.com

Worms need a bedding which we can easily provide by placing shredded newspapers or cardboard for them to tunnel in. Since worms need a bit of moisture, make sure to have extra beddings to absorb it.

Provide the Basic Needs

To create an environment for them to thrive, we also need to add sawdust, cornmeal, straw, or coco coir. Now for their food, give them kitchen scraps such as fruit and vegetable peelings, coffee grounds, tea bags, grains, and bread.

Provide the Basic Needs

Basically, they tend to produce more nutritious castings if they get a well-balanced diet. But avoid giving them meat or dairy which often attracts bad bacteria. Also, make sure they don’t run out of fresh food to consume. A good rule of thumb is to provide a pound of scraps to a pound of worms.

TIP: Got a rich soil using earthworm castings, what’s next? Check out my marijuana seed bank

Step 4: Harvest the Castings

Harvest the Castings
Harvest the Castings – Image powered by grow-it-organically.com

Depending on the size of the container and the number of worms, we can harvest the castings every two months.

4. How do we use it?

How do we use it
How do we use it – Image powered by 420magazine.com

We can use the castings right away or store it for the next growing season. But don’t be disappointed if we extract only a handful from the bin. In favorable conditions, the worms multiply rapidly and will make more castings if we provide them enough food.

To use, simply mix the castings with the compost or use it as a side dressing for an indoor plant. We can also use the “worm tea” by watering it to plants that need a boost. Whichever way we use them, we can expect to see satisfying results.

Using Worm Castings

There is nothing more natural than using worms to enhance the quality of the soil. Since they are nature’s fertilizers, they offer the most abundant nutrients with the least harm to the environment. Hence, growers who practice this method get the most nourishing soil and the healthiest plants.

To get started with worm castings, learn everything about it first. While the process comes naturally, we need the knowledge and skills to sustain it. By doing so, we get decent amounts of the castings that will boost our chances of getting a successful harvest every time.

The founder of I Love Growing Marijuana, Robert Bergman, is a marijuana growing expert that enjoys sharing his knowledge with the world. He combines years of experience, ranging from small-scale grows to massive operations, with a passion for growing. His articles include tutorials on growing... [read more]


Please Post Your Comments & Reviews

Your email address will not be published. Required fields are marked *

  1. By Scott Losito ,03 Jan 2015
    dn't seeds.thks marijuana plant care.great company.thks for support
  2. By garce ,16 Mar 2015
    how about castings from dermestid beetles ? a friend of mine is using them to prep skulls and i can the castings , just wondering if they would be good or bad to amend my grow soil with .. thanks […]Read More
  3. By Stop Magnesium Deficiencies In Marijuana Plants Now! ,22 Feb 2016
    […] Worm castings […]
  4. By How To Grow Just One Marijuana Plant At Home – TheJointBlog ,21 Jun 2016
    […] someone who is interested in keeping things as organic as possible, you may want to look into using worm castings instead of chemical fertilizers. Organic worm castings, although expensive, are certifiably […]
  5. By Extremis ,31 Jan 2017
    Hi, I actually used ONLY worm casting for the germination/seedling phase. is it a mistake? What can I do to correct it if it's one.
  6. By Grass Chief ,26 Oct 2017
    Casting of earthworms in the plantation of marijuana, is purely organic and extremely rich in both the main nutrients and trace minerals that are essential to the plants.
  7. By Zach ,03 May 2019
    Trying to find out if it's okay to pot plants in mostly just wormcastting mix or am I just dooming my plants
  8. By Carmella ,28 Jul 2019
    When should you apply worm caseings every other watering or every month ect
  9. By Ronnie ,11 May 2020
    How soon can we add them I put a half a teaspoon of castings to a red solo cup with a two week old plant in them and now I’m worried it might have been too soon I have a […]Read More
  10. By Joe Blow ,22 Oct 2020
    When is a good time to add earthworms to potted cannabis plants? My plant is about to be out of the seedling phase soon and I have a ton of decaying organic matter in the pot. Should I add worms […]Read More

World Icon

200 grow guides

500 Helpful Articles

Group Icon

35,000+ Daily Visitors

500,000+ Grow Bible readers

Plant Icon

1500 Strain Reviews

100 Strains For Sale