Mary Oliver penned her first poem at age 13. For decades, she was the literary world’s best-kept secret, biding her time so all of us could prepare for her words, which didn’t just describe the beauty of the world; they were the exact linguistic equivalent of it. In her late 40s, she won the Pulitzer Prize, proving Oliver was like the flora she so often wrote about—she just needed a little time to bloom. Featuring interviews and recitations of h…