I've always grown leeks as a winter crop here, and this winter grew a great many (American Flag) for the first time, all in large container gardens. Quite a few remain to be harvested, but as an experiment I will leave several to grow to see how they fare in the summer heat, and if any behave as a biennial as they are in cooler climates. SUPER long shot hope that one or more becomes perennial. They are an allium but I can never remember the species, something like amperolasum or something. I love to use the leaves and the bulbs in many dishes, also love them raw like a scallion.