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Hardiness: 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 Handling plant may cause skin irritation or allergic reaction
Bloom Color: Medium Blue Blue-Violet Violet/Lavender White/Near White
Bloom Time: Late Midseason (MLa)
Foliage: Herbaceous
Other details: Average Water Needs; Water regularly; do not overwater
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline)
Patent Information: Non-patented
Propagation Methods: By dividing rhizomes, tubers, corms or bulbs (including offsets)
Seed Collecting: Allow pods to dry on plant; break open to collect seeds
On Apr 26, 2009, Joan from Belfield, ND (Zone 4a) wrote:Editor's Note
Rhizomes (thickened roots) and rootstocks, fresh or dry, of all Iris species and cultivars are poisonous if ingested. Symptoms include nausea, vomiting, abdominal pain, diarrhea and elevated temperature following ingestion. Some resources claim the toxic principal (irisin, iridin, irisine) only cause low toxicity if eaten.
Skin irritation can develop upon contact with seeds, rhizomes, rootstock, or cell sap.
We tend to err on the side of caution in PlantFiles, and the danger notation in the details above is to warn gardeners, parents, and pet owners to look further for more information.
On Nov 25, 2004, rainbeau from Connersville, IN wrote:
PLANT THRIVES IN INDIANA CLIMATE. NEEDS LITTLE OR NO FEEDING. SUN OR PARTIAL SHADE WORK FINE.
SEEDS PRODUCE SECOND YEAR BLOOM IN SLIGHT VARIATIONS OF SHADES OF LAVENDER WITH OCCASIONAL WHITE. PODS PRODUCE LARGE QUANTITIES OF SEED.
NICE PLANT FOR THE NATURALIZED ROCK GARDEN. FOLIAGE STAYS NICE AND GREEN FOR THE SUMMER BUT TENDS TO BE A LITTLE FLOPPIER THAN MANY OF THE SPECIES IRIS.
On Oct 12, 2003, docturf from Conway, SC (Zone 8b) wrote:
The Japanese Roof Iris does very well in coastal South Carolina and provides an interesting "topic" plant. Mine was planted in 1990 and has thrived ever since with very little care and only 2 fertilizations during that period of time.
On Oct 11, 2003, Terry from Murfreesboro, TN (Zone 7a) wrote:
Roof Iris or Root Iris? Or is it a Wall Iris?
It IS grown on thatch roofs in Japan, hence its most common vernacular name. Some sources suggest that when space became too precious for anything but food crops, Japanese women - who used the powdered rhizomes as a face powder - began growing Iris tectorum on their thatch roofs. Other legends indicate it was used to ward off evil spirits; or perhaps it was for purely pragmatic reasons (to help hold the thatch together.)
"Root Iris" is less-often used, and possibly the result of a misinterpretation of "Roof".
"Wall Iris" is its third common name, and it's suggested for planting near a wall (it will take more shade than many other Iris species.)
No matter what you call it, the pleated leaves and pretty blooms make it well-worth growing in your garden (or thatch roof!)
Regional...
This plant has been said to grow in the following regions:
Los Angeles, California Stockton, California Norcross, Georgia Calvert City, Kentucky Belleville, Michigan Tulsa, Oklahoma New Hope, Pennsylvania Wilkes Barre, Pennsylvania Conway, South Carolina Houston, Texas Mechanicsville, Virginia Madison, Wisconsin
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