Isaki Kasahara

Arborist in Tokyo, writing on Japanese trees.

I care for trees in Tokyo — gardens, homes, temple grounds and city streets — and write in English about the Japanese ways of pruning, diagnosing and protecting them.

Tree care in TokyoRead the Journal
In the fieldPruning, climbing, garden careTree diagnosisResistograph and sonic tomographyJapanese techniquesNiwaki, karikomi, sukashiWritten in EnglishFirst-hand notes from Japan

Where to start

Three ways in.

Whether your tree is in Tokyo, your garden is abroad, or you simply want to understand Japanese trees.

In Tokyo

Book a site visit

Pruning, tree removal, tree risk checks and Japanese garden care for homes, company housing, schools and facilities — in English.

Tree Care in Tokyo

Abroad

Invite me to your garden

Japanese gardens, botanic gardens and universities outside Japan: on-site pruning and diagnosis, staff training and talks, planned as one visit.

Get in touch

Read & explore

Learn from the field

Articles on Japanese garden techniques, sacred and heritage trees, tree diagnosis, tools and the trees of Tokyo.

Read the Journal
Isaki Kasahara, arborist in Tokyo

About

Hands on trees, every week.

I am a Japanese arborist based in Tokyo. Most of my weeks are spent on site: pruning garden trees, climbing large trees to inspect them from inside the crown, and measuring decay with diagnostic instruments.

Very little of what Japanese gardeners and arborists know is written down in English. This site is where I write it down — what I see, measure and do in the field.

More about me

Journal

Latest articles

Garden techniques · Sacred & heritage trees · Tree diagnosis · Tools & materials · Trees in Tokyo

All articles

Field record

  • SpeakingGuest lecture on Japan’s sacred trees, University of Toronto (2026)
  • InstrumentsIML-RESI PowerDrill · PiCUS Sonic Tomograph · ArborSonic 3D
  • FieldworkRope-access climbing for aerial tree inspection
  • LanguagesEnglish and Japanese

Newsletter

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