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Dutch iris [Iris x hollandica] may be fall-blooming in response to mild temperatures, shallow planting depths, and soil moisture access. Generally, they're planted 4-6" down into soil. Their two-week long blooms may be triggered by shallow planting. Frost damage therefore may be a concern. Covers may protect against the extremes of fall air temperatures. But they mustn't be in contact with plant parts, or made of plastic. A 2-3" layer of organic mulch evens out soil temperature extremes. And watering, from planting to frost dates, evens out soil moisture extremes. Gardeners need to break time down into successive 7-10 day blocks. Supplemental watering needs to be done every 1 - 1-1/2 weeks in which there hasn't been a rain or snow fall event

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Q: If dutch iris blooms in fall will it be destroyed by frost?
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