Young leaf clump. leaves are bright green and smooth. May be mistaken for Foxglove Digitalis purpurea leaves, which are more blue-green and very downy.

Flowering stem. Note that most leaves will have some insect or slug damage.
May be mistaken for Sorrel, which is in the same family. Sorrel has smaller heart-shaped leaves with a lemony taste. This is not critical, as Sorrel is also edible.