Byzantine Gladiolus is a winter-hardy bulbous perennial native to the Mediterranean that brings dramatic purple-magenta to maroon spikes of funnel-shaped flowers to your garden each late spring and early summer. Growing 12 to 24 inches tall with narrow, sword-like foliage arranged in distinctive fans, this botanical variety thrives in hardiness zones 7 through 10 and rewards gardeners with showy flowering spikes that can reach up to 15 blooms each. Plant corms in fall for reliable performance year after year in full sun and well-drained soil.
Full Sun
Moderate
7-10
24in H x 18in W
—
High
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Byzantine Gladiolus produces striking purple-magenta to copper-red flowers on tall, sturdy spikes that emerge reliably each June and July, even in northern gardens where you can treat it as a perennial. The flowers themselves are notably funky and aristocratic, with each bloom reaching 1 to 3 inches long and arranged in dense racemes that command attention. Unlike the more familiar large-flowered gladiolus, this variety is genuinely cold-hardy enough to survive winter outdoors in zone 7, making it a rare bulb that returns season after season without lifting and storage.
Byzantine Gladiolus is grown as an ornamental plant, valued for its dramatic flowering spikes that add vertical interest and rich color to garden borders and mixed plantings. The tall, showy flower stems work well as cut flowers for arrangements.
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Plant corms in fall, 4 inches deep and 4 to 6 inches apart in groups of at least 5 to 7 corms. Choose a location in full sun with fertile, organically rich, well-drained soil.
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“Byzantine Gladiolus carries its heritage right in its name. This subspecies is native to the Mediterranean region, where it has grown wild and in cultivation for centuries. The genus name itself derives from the Latin gladius, meaning sword, a fitting reference to the plant's characteristic narrow, blade-like foliage that has made gladiolus recognizable across cultures and climates.”