After the irises bloom in the spring, they may form seed pods, and those ripe seeds (which should be dark and shiny) can be saved and planted to grow new irises. How Far Apart do you Plant Irises. How to Plant Iris Seeds. But they require specific conditions to germinate successfully, including a period of cold weather, so the best time to plant iris seeds is in late fall and winter. Choosing Iris Bulb Seeds. You can also buy them already potted up at nurseries and if you plant them carefully, they will bloom this spring. A good rule of thumb for planting Iris in groups is 6 to 12 inches apart. As with bearded varieties, and especially in Mediterranean climate zones, beardless iris bulbs should be planted in the fall -- before heavy rains saturate the soil. In case you don’t know, rhizomes are the underground stem from which irises grow. Some afternoon shade is beneficial in extremely hot climates, but in general irises do best in full sun. Seeds can be planted straight in the soil, or in pots sunk into the ground. Increasing means make new rhizomes you can divide out later for more Iris. Iris will grow in deep shade, but probably not flower. Plant the seeds about 1/2 inch deep in a small pot with planting soil. First, soak the seeds in water (using a pudding bowl, cup, or similar) for at least 48 hours up to 2 weeks. As mentioned, you will find many options when looking for iris varieties to plant and grow. If they are big with lots of green on the leaves, and if they are reblooming types, you may even get a bloom this fall. Replanting Iris … Each row should be clearly labeled, and only a very light mulch may be applied and removed in the spring. The iris is grand and beautiful. Iris seeds can be planted at any time, but the best time to plant the seeds is during the fall/winter/ and VERY early spring months. The tell-tale sign that it’s time to plant iris bulbs is when nighttime temperatures hit anywhere from 40 F to 50 F and up. You can plant the rhizomes in the spring. A raised bed or planting on a slope are ideal places to plant iris. A: If you are both adventurous and patient, you’ll get lots of enjoyment from propagating iris from seed. When the seedlings sprout, transfer them to the garden to enjoy fresh new iris flowers this spring. Provide your irises with good drainage. Most online sellers will not send the rhizomes out until August. A planting depth of 1 cm or 1/2 inch is suitable for most seeds. Where To Plant Irises require at least a half-day (6-8 hours) of direct sunlight. Named after the Greek goddess who rode rainbows, it comes in more than 300 species in the genus Iris.Bearded irises (Iris germanica) are the most popular and bold, while Siberian Irises (Iris sibirica) add a gentle eastern flare to the garden.The glorious history behind the iris paves the way for a flourishing, reliable future. The swollen seed pod below the faded flower contains several seed. How To Plant Irises from Existing Bulbs When the pod dries and begins to split (which may take several weeks) you can collect the dark seed and plant them in a sunny, evenly moist spot. In colder climates, deeper planting is recommended to prevent the heaving of seeds out of the ground from freezes and thaws. I leave at least 12 inches so they new Iris can grow and increase. How to divide Iris in Spring…Because I know things can get away from us and we miss the optimum times to do certain garden chores. 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