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Effect of Vernalization Duration and Storage Method on Forcing of Tall Bearded Irises


The rhizomes of 3 cultivars of tall bearded irises (Iris spp.)—‘Cayenne Capers’, ‘Babbling Brook’, and ‘Stepping Out’—were stored at 2°C for 9, 14, and 18 weeks and then forced to anthesis in a greenhouse. During vernalization, rhizomes were either planted into pots or placed on cooler shelves. Rhizomes of ‘Cayenne Capers’ required no vernalization to develop the flower bud, yet vernalization was required for ‘Babbling Brook’ and ‘Stepping Out’. The longer the vernalization period, the shorter the time to flower after being removed to the forcing environment. Rhizomes not planted during vernalization required more time to flower than those which were planted.