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. 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. I love bearded Iris. The iris is grand and beautiful. Some beardless irises may be planted in early spring. In colder climates, deeper planting is recommended to prevent the heaving of seeds out of the ground from freezes and thaws. How To Plant Irises from Existing Bulbs Most online sellers will not send the rhizomes out until August. You can plant the rhizomes in the spring. The genus Iris includes over 200 species of plants widely grown in U.S. Department of Agriculture plant hardiness zones 3 … 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. A good rule of thumb for planting Iris in groups is 6 to 12 inches apart. It works very well and you can still get blooms. Cover the top of the pot with plastic wrap for about ten days to keep moisture trapped in the pot. 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. Some afternoon shade is beneficial in extremely hot climates, but in general irises do best in full sun. Plant the seeds about 1/2 inch deep in a small pot with planting soil. Where To Plant Irises require at least a half-day (6-8 hours) of direct sunlight. 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 case you don’t know, rhizomes are the underground stem from which irises grow. How Far Apart do you Plant Irises. A raised bed or planting on a slope are ideal places to plant iris. 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. The swollen seed pod below the faded flower contains several seed. 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. Even though many shrug them off as they only bloom a few short weeks in Spring I still love them in my garden. You can also buy them already potted up at nurseries and if you plant them carefully, they will bloom this spring. When the seedlings sprout, transfer them to the garden to enjoy fresh new iris flowers this spring. 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. A planting depth of 1 cm or 1/2 inch is suitable for most seeds. How to Plant Iris Seeds. Provide your irises with good drainage. As mentioned, you will find many options when looking for iris varieties to plant and grow. 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. Replanting Iris … Increasing means make new rhizomes you can divide out later for more Iris. Each row should be clearly labeled, and only a very light mulch may be applied and removed in the spring. First, soak the seeds in water (using a pudding bowl, cup, or similar) for at least 48 hours up to 2 weeks. However, they may not root deeply or bloom until the following year. A: If you are both adventurous and patient, you’ll get lots of enjoyment from propagating iris from seed. Choosing Iris Bulb Seeds. Iris will grow in deep shade, but probably not flower. 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