byzantinus is a perennial to 90cm, growing from a corm, with erect sword-shaped leaves nearly as tall as the … byzantinus benefits from being planted in autumn. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Synonyms Gladiolus nanus 'Byzantinus' Gladiolus byzantinus. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Genus Gladiolus are cormous perennials with fans of sword-shaped or linear leaves and spikes of funnel-shaped flowers . Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Other common names Byzantine gladiolus . Plant the corms 10-16cm deep in well-drained soil. Details G. communis subsp. Unlike other gladiolus, Gladiolus communis subsp. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Family Iridaceae . Use grit or sharp sand to aid drainage if you need to. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring. Common Name: Whistling Jack, GLADIOLUS COMMUNIS BYZANTINUS; Height: 60-90cm; Packet content (approximately): 4; These vigorous perennials have linear leaves up to 24 inches long with spikes of up to 20 funnel-shaped, marked, deep magenta flowers which appear in spring.