Notes from the Apothecary: Heather   Heather or ling, Calluna vulgaris, is a short, evergreen, bushy shrub with stalks of tiny purple, pink or white flowers, prolific on moorland or heathland. It’s native to Europe but has been introduced to many countries across the world. It often indicates areas of deforestation, where trees have not been allowed to grow back, so the heather and other shorter plants take over. I asked my three-year-old which plant I should explore for this month, and she said, “A pink one!”. After some pondering, I showed her some pictures of pink, purple, and white heather stretching across the moors, and she was delighted. So,…