What is the oldest tree in Graz?
Graz's most solidly dated protected tree is the Augarten Field Maple, growing at the eastern edge of the Augarten park in the Jakomini district. Its formal legal protection dates to 1979, but Wikipedia's own record of Graz's protected trees cites an earlier source, a 1956 survey of the city's planted broadleaf trees, which already listed this exact maple as worth protecting. That gives it a documented floor of at least seventy years old, decades before most of Graz's other protected trees, whose designation dates cluster in 1979, 1990 and 2000 with no age ever published for the trees themselves. Two oaks on Panoramagasse, protected on the same day in July 1979, carry real 2015 field-measured girths (2.80 and 4.90 metres) that likely put at least the larger one older still, but converting a girth into a year needs a cited growth rate this page does not have in hand, so no number is guessed.
This page is built on the City of Graz's own live Naturdenkmale open-data register (geodaten.graz.at, CC BY 4.0), cross-checked tree by tree against Wikipedia's independently maintained 'Liste der Naturdenkmaler in Graz', which geocodes each entry separately and in several cases carries real field measurements or historical citations the register itself does not. This page publishes ten trees that verified cleanly against two independent sources and pass the access test: eight around the city centre, spanning the Schlossberg hill, the Volksgarten park, the Augarten, Schillerplatz and the Panoramagasse hillside, and two more inside Schlosspark Eggenberg, a UNESCO World Heritage palace park about 3.5km west, where a wider planting of ten designated trees yielded only one pine and one beech with individual documentation strong enough to publish; the remaining eight (five planes, three more pines) share an address and a protection date but no individuating record, and read as one avenue rather than separate collectible points. Two more candidates, a Paulownia at a kindergarten and a pair of trees at a state youth-care home, were found and held back under this project's rule against sending visitors onto school or institutional grounds without clear evidence they are open.
See more themed collections of remarkable trees.