Elderflowers come from the Elder tree, which is generally described as a shrub. Their young growth is bright green, mature stems light brown and the bark of the trunk deeply furrowed. The leaves are feather shaped with slightly serrated edges and set opposite each other in pairs of two or three, with a leaf at the tip of each twig. The flowers are unmistakable, like flat, open umbrellas between ten and twenty centimetres in diameter. That said they are similar at a glance to the Mountain Ash, but comparing both online before setting out to forage will demonstrate the difference. Each flower head is covered in tiny, creamy white flowers with yellow stamens. The scent is the best guide of all - muscat, sweet, heady and incredibly rich - lingering for hours in your fridge or larder.