Iris plants won't bloom - Knowledgebase Question

Blackwood, Ne
Question by sroberts1170
June 19, 2009
I have some very old Iris plants that have been separated (1 year ago) and they have no flowers at all this year.I moved them 12 inches apart as they were growing on top of each other.


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Answer from NGA
June 19, 2009

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Your experience sounds a bit suspicious. Here's some background information: Bearded Iris (the most often planted in gardens) grow from rhizomes that continue to grow on both ends. The older center part sometimes produces foliage but doesn't always produce a flower stalk. Iris beds should be dug and divided when the plants become overcrowded. The first indication that the clumps are overcrowded is failure to bloom. Iris grow best in full sunshine, in rich, moist soil. Given the above information, were the iris rhizomes you planted the new ends or the old centers? Did you amend the soil prior to planting and place the rhizomes just at the surface of the soil? Are they getting all day sunshine? And, finally, are they spaced 1'-2' apart? Hope the above information helps you track down the probable cause of non-flowering.

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