Why the Oriental Arborvitae Faces West: The Story Behind Baekjain

Every other tree leans toward the sun, the Donguibogam says — except one. That observation is why the character for this tree contains the character for white.

Baekjain (柏子仁) is the seed of the oriental arborvitae. When the Donguibogam describes Baekjain, it notices the tree's direction of growth before its use: every other tree reaches toward the sun, it says, but the arborvitae alone faces west.

An observation written into a character

West is the direction matched to white, and to metal (金), in the five-phase scheme. So the characters for tree (木) and white (白) combine to form 柏, and the tree was thought to hold the purest, most concentrated metal qi. It is a different interpretive system from modern botany, but it is striking how one character carries both an observation and a worldview.

Baekjain as a medicine

The Tangaek-pyeon records it as neutral, sweet and non-toxic, naming startle-palpitations (驚悸) as its main use, followed by settling the five viscera, adding qi, and moistening the skin. That is why it is classed among herbs that calm the mind.

Worth knowing

Because the seed is oily, it was traditionally lightly roasted to remove oil before use, and is said not to suit people with loose stools. Another herb associated with the mind is Polygala.

This article introduces classical records for education and does not replace diagnosis or prescription.