this sighting was certified a sleeper weed - certainly not sleeping east of the Fair where 3 different cultivars have been planted as Street trees and do their best to invade nature reserve ... I learnt today, that they invade residents tiny gardens and public space at the Fair and the rose garden which has a 1.5 m tall Callery pear iplanted by birds. This is already a nightmare and not a sleeper ... see also https://majura.org/callery-pear-request-to-stop-the-invasive-nightmare/