Starting mid-month, bearded iris rhizomes arrive in area nurseries. These drought-tolerant, spring show-stoppers now often bloom longer or more often, adding to their appeal to San Diego gardeners. Look for such rebloomers as pure white ‘Frequent Flyer’, burgundy and pale yellow ‘Paprika Fono’s’ and lavender and deep purple ‘Cloud Ballet’. When buying iris, look for firm, plump rhizomes with a fan of green leaves. Plant them with the top of the rhizome exposed to the sun.