The Scarlet Pimpernel (Anagallis arvensis), although just a tiny delicate flower can be found all over the World. The flower only opens when the sun shines, at other times you would probably not even notice the green stems that grow laterally amongst grass. The flower itself if very small, but the stems of the plant can grow up to 50cm in length. In the Mediterranean region the flowers are blue being a sub species of the plant (Anagallis foemina). It is an 'Annual' and therefore reseeds from the centre base of the plant.