The purple falls are reason enough to incorporate these brilliant blooms in your landscape. Then you bring in the strong color contrast between the standards and falls and it's simply mesmerizing—the color really pops wherever you want to put this Siberian iris. Enjoy a little patch of it in among your other perennials, or plant it in mass drifts for a radiant display. We suggest growing it near a stream or in a marshy, waterlogged spot. While most iris absolutely need well-drained soil, Siberian iris are actually at the top of their game in really moist soils. Iris sibirica 'On Mulberry Street'