Journal

Arboriculture Knowledge from Japan

Field documentation, research, and insights on Japanese tree culture, tree diagnosis, garden design, urban greening, and landscape stewardship.

Aerial Tree Diagnosis at a Tokyo Temple: What Arborsonic 3D and Rope Climbing Revealed Inside the Trees

Tree Risk 2026.05.15

Aerial Tree Diagnosis at a Tokyo Temple: What Arborsonic 3D and Rope Climbing Revealed Inside the Trees

In Japan, a certified tree specialist known as a jumoku-i (樹木医) carries the responsibility of diagnosing and treating trees — from ancient… Read Article

Japan’s Falling Trees Crisis: When the Postwar Planting Boom Reaches Its Limit

Tree Risk 2026.05.03

Japan’s Falling Trees Crisis: When the Postwar Planting Boom Reaches Its Limit

Japan’s Falling Trees Crisis: When the Postwar Planting Boom Reaches Its Limit Introduction In April 2026, an 18-meter cherry tree with a… Read Article

How to Read Tree Decay Without Technology: Japanese Field Methods

Tree Risk 2026.04.25

How to Read Tree Decay Without Technology: Japanese Field Methods

How to Read Tree Decay Without Technology: Japanese Field Methods Introduction Strike a wooden mallet against the trunk and listen. Press a… Read Article

VTA vs. Jyumoku-i: Comparing Two Tree Diagnosis Systems — Western Science Meets Japanese Expertise

Tree Risk 2026.04.12

VTA vs. Jyumoku-i: Comparing Two Tree Diagnosis Systems — Western Science Meets Japanese Expertise

VTA vs. Jyumoku-i: Comparing Two Tree Diagnosis Systems — Western Science Meets Japanese Expertise Introduction How do you decide whether a tree… Read Article

What is a Jumoku-i? Japan’s Certified Tree Doctor Explained

Tree Risk 2026.04.05

What is a Jumoku-i? Japan’s Certified Tree Doctor Explained

A Jumoku-i is a nationally registered tree specialist in Japan, certified in the diagnosis, treatment, and preservation of trees. The certification was… Read Article