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Missouri Botanical Garden PlantFinder lists garden Gladiolus (the hybrid group, commonly designated Gladiolus × hortulanus) for USDA zones 7 to 10 in full sun and medium moisture, blooming August to September at 1.5-6 ft tall and 1-2 ft wide. NC State Extension gives the same hardiness span (7a-10b) and a matching 1-6 ft height / 1-2 ft width.
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Not winter-hardy below zone 7: Missouri Botanical Garden PlantFinder directs gardeners in colder zones to dig the corms after frost and store them dry, frost-free, over winter.
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A genus of about 180 species native mainly to South Africa (also the Mediterranean, Arabian Peninsula, and northwestern + eastern Africa) per Missouri Botanical Garden PlantFinder; not native to North America. Modern hybrids fall into Grandiflora, Nanus, and Primulinus groups.