The SDB class consists of irises 15-40cm in height, with blooms between 5-10cm wide.
Stems may be branched or unbranched with two or more terminal buds.
SDBs generally flower after Miniature Dwarf Bearded irises and before the peak of the Intermediate Bearded irises.
Usually Fragrant and Reblooming, so plant 2-3 in a shallow wide pot to take indoors when in flower and fill the house with scent.
NB. The rhizomes of SDB iris are quite small, don't compare them to other taller iris varieties.