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Irises, an incredibly varied genus of plants, include over 300 species. This much-loved family includes ranges from rare, difficult breeds to the hardy garden variety available through Spring Hill. Most irises have ornate, showy flowers.

Some varieties of iris are planted as bulbs (bulb irises), others are available as bareroot divisions (rhizome irises). Bulb irises are Dutch,

English, Spanish, Reticulata, and Juno irises. The rhizome group includes bearded irises, crested irises, and beardless varieties such as the Japanese, Louisiana, and Siberica iris.

Irises are a varied bunch - the care requirements for these beloved flowers depend on the type. However, all irises require acidic soil and plenty of moisture. Be sure to water in well, and provide organic material.

Dutch Iris
Dutch IrisBulb Irises
Bulb irises are frequently used alongside other bulb plants: they’ll sprout with very little management and come back year after year. Bulb irises include Juno, Reticula, and other varieties. Dutch irises are the most commonly-grown bulbs in the US, due to their hardiness and large, attractive flowers. Try planting them in large groups for a naturalized, Dutch-field look.

  Grown Height Bloom Time Zone Soil Requirements
Juno 12-24” Spring. 4-8 Moist, well-drained soil.
Reticula 3-6” Early spring. 5-8 Well-watered, but draining, soil.


18 - 24" Late spring, early summer. 3-9 Well-drained, humus-enriched so
English 24-28” Spring, summer. 3-9 Well-watered, but draining, soil.
Spanish 18 - 24" Spring. 7-9

Well-drained, acidic soil.

Rhizome Irises
Rhizome irises include delicate flowering plants, falling into three categories: bearded, beardless, and crested. As 

Tennessee Iris

the names imply, these categories describe the shape of irises’ unique flower heads. Japanese and Louisiana irises fall into the bearded category, and are popular perennials.

Rhizome irises grow best in slightly acidic soil and full sun. Plant the rhizomes near the surface, and water well. Again, growing instructions will differ on these strikingly diverse flowers.

  Grown Heights Bloom Time Zone Soil Requirements
Tennessee 6 - 8" Early to mid-spring. 3-9 Well-drained, organically rich, moisture retentive soil.
Siberian 24 - 30" Early Summer. 3-9 Well-drained, moisture retentive soil.
German 38-40" Mid to late- spring. 4-9 Well-drained, hummus-enriched soil.
Louisiana 18-24” Spring. 4-9 Well-fertilized, acidic soil.
Siberian 24-36” Spring, summer. 4-9 Moist, loamy soil.