It has gone quite wrong with planting gingko biloba trees in Valkenswaard, Noord-Brabant. The female trees are dioecious, with separate sexes, and the female trees produce seeds that contain a type of acid that ‘smells like rancid butter or vomit’, although the residents of the city say it smells like poo.
The goal was to plant male trees that look slightly different and don’t have an odour, but that got messed up, and some streets apparently smell really disgusting. Residents are cleaning up the seeds, but even after putting them in the bins, they continue to stink the place up. The trees will not be replaced, but the seeds will be cleaned up by the city more often.