One of the best organic material ingredients that you can include in a succulent mix is earthworm castings. Worm castings provide numerous benefits to succulents and cacti and can boost plant growth tremendously.
The physical structure of worm castings makes it impossible to pack together. This allows drainage and aeration in the soil mix. It can absorb moisture when you water but releases it well also. High-quality worm castings have thousands of beneficial microbes that help create an ideal environment for succulent growth.
Worm castings also have a neutral PH as well as numerous trace minerals and nutrients. Succulents really respond to the castings, they’re easy to handle, and they have no smell. They’re really the secret ingredient in succulent soil, provided they are high-quality castings.
When combined with other ingredients that supply drainage, earthworm castings make the perfect “secret ingredient” for your succulents. We don't call them “nature’s perfect plant food” for nothing.
The microbial life alone will make such a massive difference with your plants that you may not believe it. The trace minerals and nutrients, physical structure and moisture regulation will also play a vital role in the growth of your succulents. By adding mineral materials for drainage, you can create an amazing natural soil that succulents love.