Native to the winter-rainfall regions of the Western Cape of South Africa, Gladiolus cardinalis is one of the most spectacular of the genus, known for its vivid scarlet-red flowers boldly marked with white on the lower petals. It grows along stream banks and moist rocky slopes, often clinging to steep terrain, where its tall flower spikes catch the eye from a distance.
This species is best grown in a Mediterranean-style climate or under protection in colder zones. Plant the corms in autumn in a sharply drained, humus-rich soil and provide ample moisture during the winter growing season. Dormant in summer, it appreciates a dry rest once the foliage dies back. G. cardinalis is well-suited to containers, alpine houses, or specialized bulb frames, though it can also thrive in frost-free gardens with winter rainfall. It is hardy to approximately USDA zone 9, and will require lifting or protection in colder climates.
A choice collector's plant, this gladiolus rewards careful cultivation with brilliantly showy flowers and a glimpse into South Africa’s rich floral diversity.
Native to the winter-rainfall regions of the Western Cape of South Africa, Gladiolus cardinalis is one of the most spectacular of the genus, known for its vivid scarlet-red flowers boldly marked with white on the lower petals. It grows along stream banks and moist rocky slopes, often clinging to steep terrain, where its tall flower spikes catch the eye from a distance.
This species is best grown in a Mediterranean-style climate or under protection in colder zones. Plant the corms in autumn in a sharply drained, humus-rich soil and provide ample moisture during the winter growing season. Dormant in summer, it appreciates a dry rest once the foliage dies back. G. cardinalis is well-suited to containers, alpine houses, or specialized bulb frames, though it can also thrive in frost-free gardens with winter rainfall. It is hardy to approximately USDA zone 9, and will require lifting or protection in colder climates.
A choice collector's plant, this gladiolus rewards careful cultivation with brilliantly showy flowers and a glimpse into South Africa’s rich floral diversity.
