The Best Worm Castings For Indoor Plants 

The best worm castings for indoor plants provide organic nutrients to your plants, leaving them well-nourished and healthy all through their growing period.

Plants require certain minerals, microelements, vitamins, amino acids, etc., in order to grow and develop into healthy organisms. These materials are present in the soil but not in the same amount as required by plants.

As we all know, our soils are becoming depleted of these important nutrients. It is, therefore, necessary to supplement the nutrient content of our soil with other organic sources. The most convenient and economical way is to use worm castings which are also known as vermicompost.

This is a mixture of worm excreta or castings that contains all the nutrients needed by plants. Worm castings are easy to make and are a great addition to the compost heap.

This article will be discussing all about the best worm castings for indoor plants and the benefits of using these for indoor plants.

What Is Worm Castings?

Worm castings are the cast out of worms’ intestines and are considered organic fertilizers. They are made by worms which are used to process vegetable wastes. These castings can be used in gardens and in compost heaps.

These castings have a rich nutrient content which is beneficial for both indoor and outdoor plants. The castings contain all the essential nutrients required by plants, such as nitrogen, phosphorus, potassium, magnesium, calcium, iron, zinc, copper, manganese, etc.

The nutrients present in these castings are absorbed by the roots of the plant and distributed throughout the plant. The worms are fed with plant wastes that are rich in carbon and nitrogen. The carbon is converted into a gas called methane which is used as an energy source by the worms.

As a result of this activity, the worm casts are rich in nitrogen, phosphorous, potassium, magnesium, calcium, iron, zinc, copper, manganese, etc. These elements are converted into a nutrient-rich liquid called worm tea. This worm tea is then mixed with the worm castings to make vermicompost. The vermicompost contains all the essential nutrients required by plants, and it is also rich in humic acids and microbial life. Worms are not only used to process vegetable wastes but also to process animal wastes.

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The Best Worm Casting For Indoor Plants

Espoma Organic earthworm castings

Espoma Organic earthworm castings are the best worm castings for indoor plants. They provide organic nitrogen and add natural organic matter to your soil. It helps promote root development in your houseplants by adding the right nutrients for healthy plant growth.

These worm castings won’t harm the tender roots of young cuttings or seedlings. They are designed for use in potted flowers, herbs, vegetables as well as raised beds.


  • It helps promote root development
  • It can be used for potted flowers, herbs, and vegetables
  • The best for indoor plants


  • Quite expensive

 Can I use worm castings on all plants

Dr Verm’s premium worm castings

Dr Verrm’s premium worm castings have very fine particles that mix well in the soil. When mixing it, keep the mix on a low ratio. If you put a huge ratio, it can result in a muddy mix and hamper drainage.

It is all-natural without any harmful chemicals. The level of consistency in these castings has been the same throughout the years. The worms used to make these castings are made from a raw vegan diet and any kind of vegetables and fruits.


  • It is environmentally friendly – contains no chemicals
  • Made from high-quality ingredients and nutritive value
  • The worms used to produce these castings are fed on a raw vegan diet.


  • This product could arrive frozen.

Worm Bliss premium organic earthworm castings

Worm Bliss Premium organic earthworm castings are one the best worm castings for indoor plants. It is the product you want to consider if your area is receiving too much sun and little rain.

It contains humic acid, which is an extra help in keeping your soil moist. Humic acid helps combine minerals and turn them into organic compounds that can be utilized by plants easily.

It also has the ability to make your soil more water-absorbent so that you will not have to worry about your garden getting dehydrated. This product can be used in different ways like composting tea, top dressing, and soil building. Starting out seedlings with a mixture of these worm castings and coco or peat makes the plant thrive throughout its growth journey.


  • It helps the soil absorb water well
  • Has humic acid that keeps your soil moist
  • It can be used in various ways


  • It’s highly water-absorbent. The plants that do not like being drenched in water might not perform well.

Frequently Asked Questions

Are worm castings good for indoor plants?

Worm castings are used as a fertilizer for indoor plants. Worms and castings have some beneficial bacteria and fungi on them.

What are the disadvantages of worm castings?

It is a one fit all solution for all plants so should be used with caution so as not to harm those plants that do not thrive under its use.

Can I use worm castings on all plants?

Worm castings can be used on many different types of plants. The type of plant you have will determine if you can use worm castings. There are some plants that may be harmed by the castings such as some ornamental plants, shrubs and trees. It is recommended that you use worm castings with caution and in moderation.

What is the difference between compost and worm castings?

Compost is a mixture of plant material and manure that has been broken down by microorganisms. Worm castings are a by-product of the breakdown of the worms' waste.

Can you give a plant too much worm castings?

Yes, there is a limit to how much worm castings you can use on plants. If you use too much, you will kill off the beneficial microorganisms that help plants grow. Worm castings are used as a natural fertilizer and for this reason, there is no limit to how much you can apply. It is recommended that you add more worm castings as your plants grow. This allows them to absorb nutrients from the soil, which helps your plants to grow.


The best worm castings for indoor plants are as indicated above, but the list is endless only that most of these castings have run out of the Amazon store. You can keep checking their availability to see if they are back to get your favorite.