IVN's Tiny Forest Programme — Nationwide Miyawaki Micro-Forests with Citizen-Science Biodiversity Monitoring (Netherlands)

The first Tiny Forest was planted in Zaandam in 2015, adapting botanist Akira Miyawaki's dense, fast-growing native afforestation method to small urban plots roughly the size of a tennis court (200-250 m², 3 saplings/m², 20-40 native species). The programme is run by IVN (Instituut voor Natuureducatie en Duurzaamheid), typically with a local school as adopter.

IVN aimed to scale a network of urban micro-forests nationwide while using citizen-science monitoring to document their ecological impact.

By the mid-2020s IVN reported more than 200 Tiny Forests on public land and close to 100 more on private ground, involving roughly 20,000 schoolchildren, 1,500 teachers and 1,200 local residents. Wageningen Environmental Research (WENR) ran structured biodiversity monitoring across 11 Tiny Forests from 2018-2021.

WENR logged 148,255 observations and documented 595 species; later network-wide reporting put the figure at 636 species, including 298 found beyond those originally planted. WENR also estimated carbon uptake at roughly 250 kg CO2/year for a mature 200 m² forest, though a young, vandalism-affected plot in Almere sequestered only about 4.3 kg in its first years.

Outcomes vary sharply with forest age and site condition. Some critics note plantings have drifted from strict Miyawaki-method species selection, and researchers have cautioned against using fast-growing non-native species or clearing existing meadows/community gardens to make way for new plots.