Now what can that be ??

Gardening again today, good old cut-back and prune, including our neighbours hedges, which he is always too busy to do, " But feel free to cut them yourself if you want to" Which we do. The Big Bag in the background is the results of our Labours.
Anyway in one of our Tubs these have appeared, they are quite likely weeds, but look quite nice, and we are just wondering if anybody out there can inform us. Long weekend coming, Football tonight (Come on you Blues !! I used to support them when they had Londoners in the Team !) Take care all,.....