We have a beautiful garden and we do not need to work in the garden often but there is one invader plant which I detest. The fruits are very successful in germinating into new plants and they are easily distributed by the birds.
If you don’t notice that one of these trees has germinated behind a bush or building and you discover it months later it is too late, the deep taproot makes it impossible to uproot by hand.
They have silver furry hairs on large leaves and the berries contain hundreds of seeds. Our one neighbour refuses to remove a bug weed tree from his garden. Little plants keep on coming up in our garden 😦
See link below for more info.