Per pg. 75 of The Beginner's Guide to American Bonsai by Jerald P.
Stowell (Kodansha, 1978),
"Briefly, the pH requirements of natural vegetation are as follows:
pH less than 3.7: heath or bog thickets
pH 3.7-4.5: tamarack, black spruce, hemlock, aspen, birch
pH 4.5-5.5: the majority of conifers
pH 5.5-6.9: the bulk of deciduous forests
pH 6.9-8.0: neutral to alkaline grasslands
All plants have a pH tolerance within which they will still
survive: for instance, the optimum pH range for the genus Malus (the
apple) is 5.5-6.5. However, they have been found growing in soil that
tests as low, or acidic, as 4.0 and as high, or alkaline, as 8.0."

In my notes I also have a list of the "optimal pH ranges for common
flowers, vegetables, trees, shrubs and grasses commonly planted around
our homes and gardens." This is per the Sunbelt Nursery Group, Inc. If
you have a specific species I might be able to give you a more specific
figure.

Cordially,

Robert J. Baran
Sunset Zone 10



Jo Trojer wrote:
Hi,

Anyone have a list with the different PH values preferred pro species? How important is it for bonsai to keep the correct PH value? Here in Innsbruck we have a high lime content in our water, does this affect the PH value after a long period?

Thanks for any help

Jo Trojer - RCI President/Coach
Innsbruck - Austria
www.rugby-innsbruck.at

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************************************************** ******************************
++++Sponsored, in part, by Kevin Bailey++++
************************************************** ******************************
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+++++ Questions? Help? e-mail +++++