Bearded iris deliver some of the most elaborate blooms in any garden — ruffled falls, upright standards, and fragrance in shades no paint can match. Plant rhizomes at the surface, not buried, for healthy long-lived clumps.
Sun: Full sun. Water: Low. Zones: 3–9. Height: 1–4 ft. Bloom time: Late spring.
Plant rhizomes in mid-summer with the top half exposed — buried rhizomes rot. Full sun is essential for bloom. Divide every 3–4 years in summer. Cut back fans to 6 inches after dividing. Siberian iris like more moisture and tolerate some shade.
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01 Why aren't my iris blooming?
Three common causes: rhizomes buried too deep, too much shade, or overcrowded clumps. Lift and divide in summer, replant with rhizome tops exposed in full sun.
02 What are the holes in my iris rhizomes — borers?
Yes, iris borer is the most serious iris pest. Remove and destroy infected rhizomes. In fall, cut leaves to 4 inches and clear all foliage debris — this removes overwintering eggs. Spring neem or pyrethrin applications help prevent new infestations.
03 When should I divide bearded iris?
Every 3–4 years, in mid- to late summer (6 weeks after flowering). Lift clumps with a fork, cut rhizomes into pieces with 1–2 fans each, and replant with the top half above soil. Discard any soft or borer-damaged sections.