Iris - Knowledgebase Question

Name: Debbie Rumphery
Lynnwood, WA
Question by dpump
December 26, 1997
I have some Bearded Iris and cannot get them to bloom. Any suggestions?


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Answer from NGA
December 26, 1997

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Bearded irises grow from rhizomes. They need good drainage but will grow in most any type of soil. Plant them in full sun, with the tops of the rhizomes just beneath the soil. Water them in after planting. They'll need to be divided every 4-5 years. When clumps become overcrowded and blooms are sparse, dig the clumps and divide them, saving the newest rhizomes on each end of the old center rhizome. Trim the leaves and replant. Fertilize in the spring with a 5-10-10 all purpose fertilizer. If yours are not blooming, make sure they're in full sun, get a low nitrogen fertilizer and adequate moisture. If they're overcrowed, wait until next August to divide, as flower buds for next year's blooms will form in July.

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