Cannas are indispensable in a subtropical garden because their foliage is so splendid. They aren’t necessarily grown for their flowers, but when they arrive, late in the season, they are a bonus. With some varieties, such as the very large canna musifolia, the flowers may never arrive at all in our climate. So it’s especially pleasing when, in a very average summer, cannas start to produce their flowers early. This photo, taken yesterday, is of a dark-leaved variety interplanted with the dark banana leaves of ensette murillii. I’ve never known a canna to come into flower so early in the season before. Why this should be, I’ve no idea.