How do iris plants grow? Learn how to plant iris rhizomes in july, august or september for best results. Read on to learn how to plant iris rhizomes. Get tips on site selection, soil preparation, planting depth, and more to grow healthy, vibrant irises in your garden. After sharing so many of my iris photos, i realized it was time to walk you through exactly how i plant my bearded iris —step by step—so you can enjoy them in your own garden too, especially if you’re planting them for the very first time. Prepare the soil by adding brick rubble, coarse gravel, and soil mixed with grit and peat to improve drainage. How do iris rhizomes affect flowering? Avoid planting them in shaded areas or in soil that stays damp. · to plant iris rhizomes , start by choosing a sunny location with well-drained soil. · unlike most plants, irises do best when their rhizome — the brown, root-like structure at their base resembling a potato — is slightly exposed to the air. · new to irises ? The plants roots should be arranged so that they spread downward beneath the rhizome. Follow the steps for soil preparation, planting depth, spacing, watering, fertilizing and dividing iris clumps. · bearded irises are magnificent perennials that grow from rhizome root structures. Learn the #1 secret in 5 fail-proof steps to get beautiful blooms and avoid the most common mistake. Do iris flowers have a rhizome? Our guide makes planting bearded iris rhizomes easy! · learn how to plant iris rhizomes with this beginners guide.