Aspen suckers?

[tree-fancier123]

was phoned up about Japanese Knotweed, said I'd never dealt with it, but could try spraying it off with glyphosate. When I got there I noticed what looks to be an Aspen tree (correct ID?)

and what I'm guessing are suckers from it - the sucker leaves if thats them have a different shape and tinted red. I told the owner no weed killer if its from the tree just strim them off, just wanted to see if anyone can confirm these are suckers from the tree. Not cut an Aspen before, or seen its suckers. Only seen it on Lombardys, where if its not mown sometimes a mini forest of them appears around the trunks

[tree-fancier123]

should have checked google images before asking - loads of images of aspen suckers looking just like the ones I photographed - seems the aspen can be a nuisance tree to have in a lawn

[skyhuck]

Yes this is common. I believe there is a quite large woodland somewhere (Australia maybe?) thats actually only one tree. I think its one of the largest living organisms on the planet.