Wood Sorrel is widespread in shady areas, woodland and damp, mossy spots, even up to 4,000 feet in the Highlands. Wood Sorrel has acid-green trefoil leaves at this time of year, and the white, five-petalled flowers, which have pink or mauve veins, drop their heads and close in dull conditions. Wood Sorrel, like Violets, are ‘cleistogamous’, meaning they undergo self-pollination and fertilisation before the flowers open. Wood Sorrel, which used to be called ‘Stabwort’ as it was thought to heal wounds, is edible and the leaves, which taste acidic and lemony, are good to quench your thirst if your out walking. Conditions: Cloud with sunny intervals and a blue-skied evening. Temperature: Max 16- Min 8c.