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 We compared worm castings vs. fish emulsion and listed their benefits, advantages, and disadvantages to help you decide. While every other option works as an organic fertilizer, you must consider the cost and proper storage. 

To sum everything up, you should know that in this case, worm casting saves a lot of storage and acts as the best reusable organic fertilizer. On the other hand, we have fish emulsion, which is more expensive but works for vegetable plants and crops.  With that being said, let's dive a little deeper to determine which is the best option for you.

Which is Better: Worm Castings or Fish Emulsion?

Worm castings and fish emulsion are organic fertilizers, but our pick for the best soil conditioner is worm castings. We choose worm castings due to many factors. They are cheap, easy to maintain, and you can make your worm castings or compost tea from them. If you get enough, you can create your worm farm to cover a more significant area in your garden. Furthermore, they do not smell like horse manure, cow manure, or chicken manure. 

It works by putting earthworm castings in a worm farm bin. They start feeding and start leaving their waste on the ground. That waste is a good source of beneficial bacteria that nourish the earth with the help of some essential nutrients like nitrogen and phosphorus. If you have potted plants, you can put some worm casting there for healthy soil with many benefits. 

Can I Use Worm Castings Instead of Fertilizer?

Yes! Worm castings are organic fertilizers. They have high nutrient levels and are full of minerals like phosphorus. Moreover, worm castings contain growth hormones and trace elements that are great for soil amendment. They have tons of benefits such as:

  • Soil conditioner
  • Also available in liquid form (worm casting tea)
  • Helps soil to absorb and hold water
  • Reduces soil erosion
  • Works faster than other organic fertilizers

Worm Castings

As worms eat organic matter in the soil, they release worm castings. It provides good bacteria, trace minerals, and other needed nutrients for your plants.

Benefits of Worm Castings

  • Highly effective organic fertilizer: In worm castings, nutrients are actively available to the plants. It does not burn plants or damage their root system. You can also put worm castings on your indoor plants or vertical garden
  • Odorless: Keep in mind that worm castings are also manure. However, it is different from any other kind of manure or synthetic fertilizers. Worm manure is completely odorless as compared to chicken manure. You can even keep a potted plant with worm casting in your room without worrying about any smell.
  • High levels of humic acid: This is a unique feature in worm castings that you will not find anywhere else. The humic acid in worm castings helps accelerate the plant's growth. This organic matter is a superfood to plants.

How Long Can You Use Worm Castings?

Worm casting stays for seven to ten years, ensuring that the process is complete. Moreover, worms will decompose once they die, fertilizing your garden soil even more.

What Are the Disadvantages of Worm Castings?

Worm castings do not have a disadvantage in supplying nutrients to your plants. However, it takes time to gather and create worm castings, or you can just grab some Simple Grow.

Fish Emulsion

Fish emulsion is a liquid fertilizer that is a byproduct of fish meal and fish oil. If you want quick results in your garden, fish fertilizer is better than chicken manure. You can mix it in water and apply it in your garden. Ensure that the water and fish emulsion mixture is the same as directed on the bottle. Moreover, fish emulsion is extremely useful as a lawn fertilizer in early spring. If you want efficient growth in your plants' roots, fish emulsion is a perfect soil feed.

Benefits of Fish Emulsion

  • Improves soil health:This liquid fertilizer actively provides nutrients to the roots and nourishes the plants. Fish emulsion is also a source of burn-free nitrogen. Unlike synthetic fertilizers, they are a good source of trace minerals and secondary nutrients such as calcium.
  • Increases plant life: If you want your flowers to bloom for a long time, then fish fertilizer is the best for that. Proper use of fish emulsion produces higher crop yields than cow manure or chicken manure. However, be careful as the fish fertilizer is strong enough to burn plants, especially potted plants.
  • Increase soil fertility: Fish emulsion makes the soil very loose, thus maintaining the balance of microorganisms and good bacteria in the ground. 

Is Fish Emulsion Good for All Plants?

Fish emulsion is needed every time you fertilize your crops. Fish emulsion is a much stronger liquid fertilizer, so make sure not to spray it directly on plants. Fish leftovers can attract a lot of animals; they can walk around and attack your plants if hungry. Moreover, fish emulsion also feeds fungi and bacteria, which can attract insects and make your plants sick.

Similarities and Differences Between Worm Castings and Fish Emulsion

Liquid Fertilizers

Worm casting is available in liquid form, and it is called compost tea or worm casting tea. It is an excellent option if you want to use liquid fertilizers for your crops and garden. 

Easy to Store

You can create your worm farm using an old bin. Moreover, worms are easy to store and cultivate. Fish fertilizer is available in bottles that you can easily add to any sprayer and fertilize the garden soil and crops.


Fish emulsion is more expensive compared to worm castings. Moreover, you can make worm castings for zero cost. You won't need to shell out extra bucks for organic fertilizer once you have enough worms to make worm casting or compost tea.

Organic Fertilizers

They are organic fertilizers with no chemical mixtures or pesticides that can harm your plants. Moreover, worm casting makes a better natural fertilizer; also fish waste is a better soil conditioner than manure.


Fish emulsion is an excellent option if you prefer liquid fertilizer over dried ones. However, worm casting is the optimum choice for a cheap alternative that works better than other fertilizers. Manure and castings are not chemical fertilizers, so you can handle them as you like.

Worm casting is an excellent soil conditioner and good for plant roots, so you do not have to worry about your garden soil. If you have some fruit trees in your garden, you can increase their productivity with the help of this liquid fertilizer.

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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