By Graham Clarke I really need to tell you about a small but beautiful range of low-growing plants that get little mention in the press, yet they are easy to grow, and when they are in flower they are dramatic, eye-catching, and will always be a talking point for anyone visiting your garden. Read all you need to know about Oxalis versicolor, more commonly known as the candy cane sorrel. And that is ironic, for I remember when I was a boy we visited someone’s garden, and my father (who was a far better gardener than I could ever be), pointed out a weed and said: "That’s creeping wood sorrel. It’s one of the worst weeds. They need to get...