These estimates for how long Japanese roof iris takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Days to Germination How long does it take Japanese roof iris to germinate?
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Days to Transplant How long until I can plant out Japanese roof iris?
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Days to Maturity How long until Japanese roof iris is ready for harvest / bloom?
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Total Growing Days How long does it take to grow Japanese roof iris?