Spiling (not spilling) is a term for the particular kind of willow weaving used to protect river banks. You can read a more detailed description of it here.
Dan from Radnorshire Wildlife Trust has just finished some spiling to protect the bank of the River Lugg from further erosion near the road bridge.
He used the willow withies from our Willow trees that we planted on a land work session in 2013!
