What is the oldest tree in Salzburg?

The oak has real urgency behind it: the same source reports a fungal infection and expects the tree to survive only about twenty more years, which makes it worth seeing sooner rather than later. Salzburg's Naturdenkmal register runs to dozens of entries, and the twenty-one here are spread across the city and beyond it, though three, an oak and two limes on separate Riedenburg streets, sit close enough to walk in one afternoon. The Erentrudishof Oak, the city's longest-protected tree (1933), stands in a working farmyard in Morzg where pigs once fattened on its acorns. A black poplar on the Josef-Mayburger-Kai promenade is one of the last traces of the riparian forest that used to line the Salzach. A plane and a black pine share a housing-estate courtyard near the main station, the only two trees left from a grand hotel's bombed-out park, and a giant sequoia stands beside a coast redwood in the formal Mirabellgarten, the one import on the list. Only the Freisaal limes carry a planting date, around 1810; other ages come from designation years, a sighting, a claim about a pair of survivors, or a visitor's tape measure, and each page says so.