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Bearded Iris
Iris germanica
Bearded Iris blooms from May through June.
Everything this page states about the plant was checked against named botanical sources, the bloom months and the water need among them, with what the sources could not settle written down.
Growing Bearded Iris
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 3–9. Expect it to reach about 2.6 ft tall and 1.3 ft wide at maturity, in roughly 2 years.
When to plant Bearded Iris
Plant or divide Bearded Iris in late summer, July to September, once its bloom is finished. That window holds across its whole hardy zones 3 to 9 range. It flowers from May to June.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 6 in July.
2 more varieties in the Irises family
Same family, similar care - pick the one you are growing.
Good to know about Bearded Iris
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses; the rhizome is the most toxic part. Eating it causes drooling, vomiting, diarrhea and lethargy. Sap can irritate skin. per ASPCA and NC State
Worth knowing
Set the rhizome on the soil surface with its top exposed, never buried or mulched over. Plant it too deep and it will not bloom, then rots. per Wisconsin and NC State
How deep to plant
Cover over the rhizome depends on your soil: sandy or hot sites take a thin cover, up to 1/2 in; clay wants it set just above grade. per Penn State and Clemson
Iris borer and soft rot
The iris borer caterpillar tunnels into the rhizome, and soft-rot bacteria follow the wounds in and rot it to slime. Cut and destroy old foliage each fall. per Minnesota and Wisconsin
Divide every few years
Every 3 to 4 years, split crowded clumps in mid to late summer after bloom. Keep firm, pale rhizome pieces with roots and leaves; toss soft or smelly ones. per Clemson and Wisconsin
Deer resistant, drought tolerant
Deer usually pass it by, and it shrugs off drought once established. The bitter, toxic compounds in the rhizome and leaves make it unappetizing to browsers. per NC State
Fragrant and reblooming kinds
Many bearded irises are fragrant, and a growing number of modern cultivars rebloom, flowering again in late summer or fall on top of the main spring show. per NC State and Penn State
What pairs well with Bearded Iris
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Sneezeweed
Shares full sun and moderate water; blooms in midsummer as this one finishes; its seed heads stand through winter, for structure and the birds; taller at 3.3 ft, for the layer behind it.
False Sunflower
Shares full sun and moderate water; blooms in midsummer as this one finishes; its seed heads stand through winter, for structure and the birds; taller at 3.9 ft, for the layer behind it.
Joe Pye Weed
Shares full sun and moderate to high water; blooms in midsummer as this one finishes; its seed heads stand through winter, for structure and the birds; taller at 5.9 ft, for the layer behind it.
Sunflower
Shares full sun and moderate water; blooms in midsummer as this one finishes; its seed heads stand through winter, for structure and the birds; taller at 6.6 ft, for the layer behind it.
Feather Reed Grass
Shares full sun and moderate water; overlaps, then carries the display into late summer; its seed heads stand through winter, for structure and the birds; taller at 4.9 ft, for the layer behind it.
Fountain Grass
Shares full sun and low to moderate water; blooms in late summer, extending the bed's season; its seed heads stand through winter, for structure and the birds; taller at 3.3 ft, for the layer behind it.
Pampas Grass
Shares full sun and low to moderate water; blooms in late summer, extending the bed's season; its seed heads stand through winter, for structure and the birds; taller at 8.2 ft, for the layer behind it.
Arborvitae
Shares full sun and moderate water; evergreen, so the bed keeps its shape through winter; stands well above at 20 ft, a canopy to plant beneath.
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