all our sheep, both soays and commercial crosses love willow. After hedge trimming, I intentionally leave the cut branches in the field for them to browse and only remove them after they have stripped the branches of all the folliage. Ivy is anoather hot favouraite. After all both plants have medicinal qualities - the sheep know what they are doing. It is from willow that salicylic acid, the active ingredient of asprin came from - they're not daft as people think!