The most popular of the irises, bearded irises are easy to grow provided that you plant them in a sunny site with well-drained soil. Plant irises in late summer, when they are finished actively growing. One major departure of growing irises compared to other perennials: They do not like mulch. Mulches (as well as deep planting) encourage the rhizomes to develop rot, so let your soil remain bare. Space plants at least 12 inches apart to prevent the need for frequent dividing. Irises need full sun to thrive. Irises in full shade produce fewer blooms and may suffer from an increase in diseases. Irises are notorious for their hardy disposition. They don't mind temperature extremes, as long as the soil allows excess rain or snowmelt to drain away. Irises that are damaged by heavy winds or hail can be susceptible to iris borer larvae entering the plants. Although it's not a common method, you can grow irises in pots that are at least 12 inches wide. Use a loose, soil-free potting mix, and leave the tops of the rhizomes exposed. Make sure not to overwater the plants. In colder climates, you may need to move the containers to sheltered locations for the winter to ensure the plants' survival.
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