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Japanese Irises have thick rhizomes, giving rise to fans of sword-shaped, usually broad green leaves, and simple or branched flower stems. Most bear multiple flowers per stem. The flowers have well-developed standards and falls. Avoid high nitrogen fertilizer. Keep mulches away from leaves and rhizomes. Water moderately during growth periods; keep dry while dormant. Japanese irises grow to 3 feet and produce flowers, 4 to 8 inches across, in midseason.