Lime (Tilia sp.) self seeded at Lightcliffe in the 1990s.
Still healthy, though rarely repotted, just watered.
Close up showing the galls they get every year.
I think it is known as Military Gall, and caused by an insect.
Another remarkable thing about those Lime trees at Lightcliffe is that when the seeds were ripe in summer, a few Black-headed Gulls would sometimes tear them off (without perching on the trees) and fly off with them.
I never saw them eat the seeds, but presumabely this is why they wanted them.