How a tree is measured
There are no strict rules concerning the measurement of bonsai, but certain practices are established. Normally we measure the height of the tree from the rim of the pot to the apex. Trees that have leaves hanging below the pot's rim, as well as cascades and semi-cascades, are measured from their lowest point to the apex. Jin are parts of the tree and count for the height as well. Tees over rock are also measured from the rim of the pot to the top of the tree or top of the stone, whichever is higher.
MEASURING THE TREE'S HEIGHT
From the pot's rim to the apex.
Cascades are measured from the lowest leaf to the apex.
If there are leaves hanging below the pot's rim, the tree is measured from the lowest leaf to the apex.
From the pot's rim to the top of the jin.
If a bonsai is planted on a stone slab we measure the total height.
The measurements of rectangular and oval pots are specified in this order: first the length, then the width and then the height. For square pots the side length and the height is specified and for round pots the diameter and height. For hexagonal and polyangular pots the outer diameter and height is specified.
The article was kindly provided by BONSAI ART.
Translation: Heike van Gunst