Calhoun County, AL – Early fall, before the first frost, is the best time to divide your iris clumps and prepare them for next season’s blooms. Iris thrive when their rhizomes receive plenty of sunlight, which means they should be planted horizontally with the top of the rhizome resting about one to two inches above ground level. Exposing the rhizome to the sun activates root growth and encourages strong, vibrant blooms. Planting rhizomes too deeply can trap moisture, leading to mold or rot.
If iris clumps are not divided regularly, the number and size of blooms will decline over time. Rhizome size varies by iris type—for example, the white Resurrection Iris features rhizomes that are double the size of typical varieties, producing equally impressive blooms.
While irises won’t flower in the shade, their lush greenery can serve as an attractive vertical accent in shaded garden areas or pots, providing a graceful alternative to ferns. Summer containers featuring coleus, caladiums, coral bells, and iris greenery can be transitioned in the fall by transplanting the iris to sunny garden spots, where they’ll reward you with blooms the following season.
Many gardeners prune iris stems in the fall, but it isn’t always necessary. New growth will often emerge naturally. However, if stems appear damaged or distorted, you can lightly trim those areas. Newly transplanted irises should be mulched before a hard freeze for winter protection. Once spring arrives, remove the mulch to allow sunlight to fully reach the rhizomes.
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Good drainage is essential for most iris varieties. A planting mix of soil and pea gravel helps prevent excess moisture, ensuring healthy root systems. Most irises bloom best in full sun from late spring to early summer. During hot weather—temperatures above 85°F—water deeply twice a week. After blooming, trim spent stalks down to the rhizome to encourage continued flowering.
With proper fall preparation, your irises will reward you with vibrant, healthy blooms year after year.
Betty Clark is a contributing writer. She has been an organic gardener since 1998. The signature flower she grows is Dahlias. She has a straw bale garden, a raised bed garden, and an in-ground garden. Both her surnames are from agricultural farming families (8 generations). Her hobbies include ancestry research, antiques, continued education classes, and workshops. She also has a background in marketing & promotions, including expos. To contact Betty Clark with gardening questions: bettyclark2151959@gmail.com
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