Intermediate Bearded Iris 'Concertina': A 1999 Sutton Introduction

Intermediate Bearded Iris 'Concertina'

Hybridized by Sutton and registered in 1999, Iris 'Concertina' represents the modern Intermediate Bearded (IB) class—irises that bridge the gap between dwarf and tall bearded types, offering the best of both worlds: substantial flowers on sturdy, wind-resistant stems.

Botanical Classification

• Family: Iridaceae (eye-rid-AY-see-ee)
• Genus: Iris (EYE-ris)
• Cultivar: 'Concertina'
• Type: Intermediate Bearded Iris (IB)

The Intermediate Bearded Class

IB irises stand 16–27.5 inches tall and bloom slightly earlier than tall bearded irises, typically overlapping with the late SDB and early TB seasons. They inherit compact stature from Iris pumila ancestry while expressing the larger flowers and broader color range of TB breeding. Modern IBs like 'Concertina' exhibit dramatically improved form over early intermediates—broad, ruffled falls, heavy substance, and high bud counts on well-branched stalks.

Cultivar Profile

The name 'Concertina' suggests a cultivar with pleated, folded, or ruffled petals—reminiscent of the musical instrument's bellows. Sutton's 1999 introduction would showcase contemporary IB breeding advances: flowers approaching TB size on shorter, sturdier stems; excellent branching with 5–7+ buds; clean, disease-resistant foliage; and vigorous increase. IBs are among the most garden-worthy irises, combining visual impact with structural resilience.

Cultivation Guidelines

Culture mirrors tall bearded irises but with even greater wind tolerance due to shorter stature. Full sun, well-drained soil, shallow planting. IBs are excellent for mixed borders where TBs might overwhelm companions. Their earlier bloom extends the iris season. Divide every 3–4 years in late summer. Fertilize lightly in early spring. An underutilized class that deserves wider planting.