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Should bonsai soil be more towards the alkaline side of the pH scale as a rule of thumb?


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Posts: 25303
Joined: Sun Feb 15, 2009 11:04 pm
Location: TN/GA 7b

Depends very much on what kind of tree you are trying to grow as a bonsai.

Here's a list of suggested pH ranges for a bunch of different trees:

You will see that many of them lean a bit on the acidic side, but there is a lot of variability. For example, maples (including Japanese maples) would want neutral to a bit alkaline. Ficus would want neutral to a bit acid. Etc...

In general, people need to remember that bonsai is just an art form for growing and styling a tree. What you are growing is not a "bonsai" it is a specific tree, juniper or ficus or cherry or whatever. The requirements of your bonsai are the requirements of that specific tree, for sun, cold dormancy, warmth, pH or whatever.
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