If old flower stalks are allowed to stand ... Bearded, beardless, and Siberian iris do not need fertilizer. Reblooming types of iris, however, do benefit from fertilizer. Fertilize repeat bloomers ...

Desire Iris plants that will flood your rain garden ... you — another spin on the bearded Iris variety. However, such re-blooming is limited to zone 5, even though it's hardy in zones 3 to ...

To best support rebloom, soil fertility must be adequate, and adding fertilizer after June bloom will help promote late-summer flower bud initiation. Vigorous young iris clumps are more likely to ...