What is this weed?

Hi All.

This thick green stalky weed has started growing in my garden. No leaves. Strong roots. Stand alone weed.

Any suggestions?

 

Looks like a young Ash sapling.

 

Thanks. But they are springing up everywhere

 

There's probably a mature Ash tree in a neighbour's garden. Allthough not in leaf at the moment they are currently producing tufts of reddish flowers at the moment which will readyly distinguish them from Sycamores.

Unless you hunt them down, Ash seedlings hide amongst/behind other plants until you suddenly notice a sizeable one that seems to have appeared from nowhere.