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Hardiness: USDA Zone 3a: to -39.9 °C (-40 °F) USDA Zone 3b: to -37.2 °C (-35 °F) USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
Sun Exposure: Full Sun Sun to Partial Shade
Danger: Parts of plant are poisonous if ingested
Bloom Color: Dark Blue
Bloom Time: Extra early (EE)
Other details: Average Water Needs; Water regularly; do not overwater Flowers are good for cutting
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline)
On Mar 22, 2004, celtic_dolphin from Boone, NC (Zone 4b) wrote:
Absolutely the first in my garden to bloom each spring. The flower multiplies rapidly - I planted in groups of 5 and they became big, beautiful clusters in just 3 years! The only down-side I can think of to this plant is that sometimes the blooms would come too early and then be frozen - but that was in zone 7 - I think they will hold off blooming for a longer period in cooler climates.
On Feb 26, 2003, vroomp from Marietta, GA (Zone 7a) wrote:
One of the first to bloom in spring, 'Harmony' make a great adition to Crocus and Daffodils adding a bit of Royal Blue with Yellow to your Spring Garden. Easily grown in full sun or light shade this Iris can tolerate a wide range of temperatures. In southern zones Bloom Time can be as early as January with mild winter temps.
This plant has been said to grow in the following regions:
Middletown, California Loveland, Colorado Lawrenceville, Georgia Chicago, Illinois Hebron, Kentucky Foxborough, Massachusetts Sandwich, Massachusetts Westford, Massachusetts Pinconning, Michigan St Paul, Minnesota Albuquerque, New Mexico Cary, North Carolina Newton, North Carolina Warrensville, North Carolina Chiloquin, Oregon Albion, Pennsylvania Lafayette, Tennessee Plano, Texas Elwood, Utah Vancouver, Washington Sturgeon Bay, Wisconsin