A good Bonsai soil is the one which makes the plant grow healthy. Making good Bonsai soil is very important for proper growth of the Bonsai plant. On line many different soil are available , but making one for your self saves money and gives satisfaction. not only that we can change the mixing ingredient preproteins in the soil depending on the species, like coniferous plants wants some what different soil from the tropical ficus varieties.
When we are making soil four main important points to be kept in Mine.
First one is Soil should contain proper nutrients.
Soil should have good aeration for proper growth of the roots. When the roots are healthy plant will be healthy.
Soil should have proper moisture holding capacity to provide coolness to the roots to develop more fibrous or feeder roots ,these roots play a main role in suppling proper nutrients and water to the entire plant for its right growth.
Main one is Soil should have proper drainage capacity so roots rotting reduces.
Keeping all these four points in mind a good Bonsai soil can be made.
We will start with what is proper drainage for the plants once you water them. how to know about it.
Once you water the plant it should come out from drainage holes of thr bottom of the plot , water should not stay in the pot. If it is coming out that means soil is good, and aeration is good, drainage of the soil is proper.
Here two videos are shared showing good drainage soil for the plant., please check them.