Several years ago, I met artist Diane Palley McDonald while doing an article about her studio’s makeover for the San Diego Union-Tribune. (The news angle was that it was on HGTV’s “Designer’s Challenge.”) When I saw Diane’s paintings, I wistfully told her how much I loved watercolors. She asked, “Well, then, why not paint your own?” I said I couldn’t possibly, never having done it, not to mention being too old to learn and too busy. She showed me paintings by her students—adults who’d never before taken a class and were convinced they had no artistic ability. They were amazing! Diane graciously invited me to attend a class, and I ended up taking a dozen. Since most of my subjects are garden-related, and you might want to paint your own flowers and plants, here’s what I learned.