What is the oldest tree in Gdansk?

Gdansk maintains an unusually large official register of protected trees, 157 individual specimens as of 2026, but only a handful carry a documented age rather than a girth-based estimate. The Ash of the Royal Rifle Factory is the strongest candidate for oldest: at approximately 280 years, it predates the Konigliche Gewehr-Fabrik, the Prussian state weapons factory built on the same Lakowa street site from 1839, by more than a century, meaning the tree was already mature when the ground around it was still a sugar refinery. Its closest competitor is the pedunculate oak at the foot of Wzgorze Luizy in Lostowice, estimated at around 250 years old and protected since the late 1980s, already standing when Prussian and Napoleonic forces clashed on the hill above it in 1813. The gap between the two, roughly thirty years, is well inside the margin of error either age estimate carries, so neither claim is treated as settled beyond reasonable doubt. Both easily outdate Gdansk's other two entries on this list, whose ages are inferred from girth rather than documented.