Reference data and technical articles

Curated, source-cited data and technical articles on tree inspection, green space maintenance, and Swiss law — public, with provenance, downloadable as CSV/JSON.

• Biodiversity Index for Urban Trees: 105 Species at a Glance

  The complete BDI table for 105 tree species per SWILD/Grün Stadt Zürich 2021 — with Adapt+ thresholds and CSV/JSON download.

• Reporting Fire Blight & Invasive Species: the 26 Cantonal Reporting Offices

  Which canton is responsible for reporting fire blight and invasive alien species? All 26 cantons, 24 with a verified URL.

• Invasive Alien Species and Notifiable Pests in Switzerland

  19 organisms with EPPO code: invasive species under FrSV Annex 2, quarantine organisms under PGesV, with reporting and control guidance.

• Maintenance Window Calendar: When Which Pruning Is Allowed

  47 maintenance windows for 31 plant profiles, including the nesting-season restriction under NHG Art. 18 (March–October).

• The Swiss Tree Inspection Guideline: What Applies Since 2026

  Since 1 January 2026, there is for the first time a joint Swiss tree inspection guideline from BSB, JardinSuisse and VSSG. What it regulates — and what it doesn't.

• Tree Owner Liability in Switzerland: Art. 58 OR Explained

  What Art. 58 OR means for tree owners, what the Federal Supreme Court ruling 4A_114/2014 says about inspection frequency — and why the German burden-of-proof model does not apply.

• Winter Service on Sundays: What Art. 51b ArGV 2 Actually Allows

  Since 1 April 2022, salting and snow clearing are exempt from Sunday permits — but only for these specific activities. What that means for crew work.

• Adapt+ Funding for Green Spaces: Deadlines, Rates, Criteria

  BAFU communication UV-2554: funding rates 25–40%, deadlines 29 Jan–31 Mar, 80% effectiveness rule. The complete overview for applicants.

• Swiss QR-bill: Specification, Check Digit, and Reference Number Explained

  SIX Implementation Guidelines v2.4: QRR reference, recursive modulo-10 check digit with worked example, layout dimensions.

• Tree Cadastre Software in Switzerland: an Honest Market Overview

  natINFO Tree, Baumsicht, StraKo, TreePlotter, DATAflor, ArborX — who does what, and where Gardinova stands (and doesn't).

• What a Tree Cadastre Really Costs

  Survey costs starting at CHF 25 per tree — a municipality with 3,000 trees pays CHF 75,000 before even buying software.

• Bitemporal Event Store: How an Immutable History Works

  Append-only, bitemporal, hash-chained — and what that does NOT prove about the past before the chain began.