Alnus glutinosa - the black alder likes to grow with it's roots in water so we have quite a lot of them down by the lake and along the shoreline. We also have a plantation of them behind the back field on the northern edge of our plot in an area which is very damp.
They are amazing trees which are quite attractive, staying green well into the autumn and producing tiny little cones (green in this picture I took this morning). T
The sheep love to eat the leaves which is fine as the alder throws up suckers everywhere and we have to cut them back.
The black alder has many medicinal uses and the wood makes beautiful furniture, turning an earthy pink colour as it matures.