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If you are wondering whether to use compost worms or worm castings to make your plants look good and healthy, then you've come to the right place. In this guide, we'll take a look at worm castings vs. compost to help you learn more about each and decide which nutrient content is best for your soil.

Our Pick

Worm compost is your best bet if you are searching for something far better than a traditional compost pile. Worm composts contain a lot of organic material, and they have far more nutrients than worm castings. Moreover, worm composts are more appetizing to plants, stimulating plant growth more effectively. Expect to spend a lot of money buying worm composts in bulk, and producing them takes a lot of time and effort.

What Are Worm Castings?

Worm castings are also known as "vermicast." Worm castings are worm dungs made by the decomposition process of various worms. 

When worms feed and interact with your garden soil, they excrete nutrient-rich waste and decompose with time. This waste or worm poop makes your soil rich in nutrient content. Worm castings are great for plant growth, and they are the best choice for small-scale vegetable farmers.

On the other hand, Worm castings are usually more expensive than compost and other organic fertilizers.

Features of Worm Castings

What distinguishes worm castings from conventional composting? Let's take a look at a few of their features

Plant Superfood

What makes worm castings so great are the worms. Worm casts are rich in digested soil left behind by several earthworm species. After these worms interact with the soil, they leave a trail of organic plant food as well as helpful microorganisms that help plants flourish.

They also aid in preventing plant diseases and ensure that the soil is as healthy as possible. In addition, castings also contain humic acids, which helps plants absorb nutrients

Natural Process

Of course, using worms to stabilize organic matter in the soil is a natural process that can make your soil rich and healthier. Using worms to make castings is a sure fun way to turn kitchen scraps and other food scraps into something useful.

Soil Structure and Water Retention

Worm castings help in soil aggregation and considerably boost the soil's water retention capacity. Note that runoff, soil erosion, and algal blooms have little effect on absorbent soils. A soil that can retain water can hold fertilizers much better than soils that don't.

Improved Pathogen Suppression

Plants that grow in worm castings-treated soil control plant pathogens more effectively than plants that grow in traditional composted soil.

The rich contents of these castings in the soil make the soil unfriendly for pathogens, preventing their growth and reproduction. And, of course, you can expect a high fruit yield when your plants are not disturbed by pathogens.


  • Removes heavy metals and toxins from soil
  • Stimulate plant growth
  • High moisture holding capacity
  • Contains many microorganisms


  • Takes time to create
  • Costs more than traditional composting

What Is Worm Compost?

A worm compost, also known as vermicompost, is the product of the decomposition process of various worms, used to create a mixture of food waste, bedding materials, and vermicast.

The process of creating a worm compost is known as the vermicomposting process. While the process of rearing compost worms in worm bins, buckets, or in a rearing pit to produce worm composts is known as vermiculture

Worm composts contain water-soluble nutrients, and they have more nutrients than animal manures and other traditional compost piles.

Although hard to make, one nice thing about the vermicomposting process is that you can turn your kitchen waste, vegetable matter, flower sticks, grass, and other organic wastes into your compost pile.

These traditional compost piles are what worms eat and decompose to give your garden soil the nutrients it needs.

Features of Worm Composts

There are only a few drawbacks to using worm composting to treat your soil. Most seasoned gardeners will gladly discard their fertilizers in favor of using these composts on their soil.

Natural Process

Gardeners use worms and organic matter to create nutrient-rich soil in the worm composting process. These composts include almost no chemicals or inorganic matter.

Increased Plant Nutrients

The inclusion of worms and other organic matter increases the number of available nutrients for plants in the soil. These nutrients easily mix with the soil and help to stimulate plant growth.

Increase Microbial Activity

The number of helpful microorganisms in the soil increases due to the worm composting process. These microorganisms help plants defend themselves against insect attacks and plant diseases.


  • Easily done in small batches
  • Works during cold weather if done indoors
  • Less nitrogen loss


  • Does not kill weed seeds
  • Hard to manage
  • Produces harmful greenhouse gases

Similarities Between Worm Castings and Worm Composts

Worm castings, like Simple Grow, and vermicompost are very similar, and sometimes these terms are used interchangeably. Both products use natural processes to stabilize organic matter in the soil. Both products have nutrient content that stimulates plant hormones and helps plants grow faster and healthier.

Differences Between Worm Castings and Worm Composts

Most gardeners tend to use both words interchangeably. So, here are some tips to help you figure out which compost is which:

  • Worm castings come from worm waste, while vermicomposts are a mix of worm castings and other organic material that has decomposed.
  • Worm wastes generally include worm poop, worm eggs, and other materials that pass from one end of the worm to another.

100% pure castings usually look a lot like black coffee grounds. Though pure castings are nearly impossible to produce, they are the real deal for stimulating soil microbial activity and boosting plant growth.

Almost anything goes in a worm compost; cattle manure, yard waste, food waste, you name it. You can apply these nutrient contents to garden plants without fear, and they are the best compost material for boosting plant growth hormones

Frequently Asked Questions (FAQs)

1. What is a worm bin?

A worm bin is a container that is used to compost organic waste. Note that some bins allow you to create compost in batches, while some allow you to recycle them and keep adding waste.

2. What is worm bedding?

A worm bedding is a long-term food source for worms rich in carbon and moisture content. Worms mainly feed on this bedding material. You can use hay straw or even shredded paper to make these beds.

3. What does worm composting mean?

Worm composting uses worms to recycle kitchen scraps and other organic wastes into vermicompost, a valuable soil amendment.


If you are looking for changes in your plant health and growth, then these organic fertilizers are what you need. Using worm composts is more preferable than using worm casting because these composts contain a high level of plant-loving nutrients.

Worms are not picky eaters, making it less expensive to feed and manage them. Finally, keep a watch on your worm bin at all times because these worms will try to escape at any opportunity.

Grow Bigger Plants with Simple Grow

Do you wish your plants would grow bigger? Was your garden less than it should've been last year?

If you're tired of growing puny vegetables and fruits, it's time for an upgrade...Simple Grow Worm Castings!

What are worm castings? Another term for worm manure. Why would you want to use it in your garden, raised beds, and house plants? Because it makes them grow bigger, faster and healthier...with no chemicals!

How do worm castings do this? It's like giving your plants a powerful multivitamin with everything they need to grow. Trace minerals, nutrients, and most importantly...worm castings are chock full of beneficial microbes. Why does that make a difference?

In recent years, we've learned the importance of gut bacteria for humans and know that it impacts so many different parts of our health. The same thing applies with worms. Gut bacteria from the worm's digestive tract gets into the soil from the worm castings and promotes plant health. Plants have a symbiotic relationship with the microbes from the worm's digestive tract. Plants respond to it and grow really big...really fast!

If you've never tried worm castings before, you owe it to yourself to give them a try. Instead of using traditional chemical fertilizers from the big box store, why not try fresh, certified organic worm castings this year? You'll be able to grow bigger, healthier plants that you actually can feel good about eating. 

Take advantage of our special bundle sale on 25lb bags today!


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