Butterfly trees in bud

Back at the end of January I planted 10 Alder Buckthorn trees, which are now in bud. This is the food plant for the caterpillars of the Brimstone butterfly, and I have planted them in a sheltered south facing place, which I hope will be ideal.

I haven't seen Brimstones in the local area, but I saw a sighting on a notice board in a National Forest area about 2 miles away last summer. So another interesting experiment - my experience so far is that if you create the right environment nature will just move in.