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Japanese Iris
Iris kaempferi
Family - Iris
The Japanese Iris is a fairly adaptable perennial flower plant for your garden. It grows from
twenty four to thirty inches tall and is hardy from USDA Zone 4 - 9. It can be planted as a water
garden plant, at the waterline of a stream or pond. It can also be planted in the flower garden in
soil which is moist, but not wet. In my garden it is planted below a retaining wall with no
particular regard to moisture and it is doing fine.
Japanese Iris is a woodland plant in its native habitat, so it will do well in shade to partial
shade. Mine is planted in full sun, and again is doing well in that location. It is native to
northern China and Japan. Flower colors run the range of blues, whites, yellows, purple, violet,
and pink. Double flowered cultivars are also available.
It is helpful to enrich the soil for this hardy perennial flower with leaf mold or other organic
matter. The soil should be somewhat acidic, so don’t add lime, bone meal, or wood ashes to the
soil in which it is to be grown.
The Japanese Iris seems to have very few pests or diseases which bother it. I have some planted in
the terrace garden and also along our pond bank at the waterline. The plants by the pond get somewhat
larger, bloom more profusely, and spread a bit more aggressively.
Propagation of this perennial is either by seed or division in spring or fall. Mine are originally
from seed, but I do dig and divide the plants in the fall to increase the stock. Japanese Iris blooms
in mid to late June here in southeastern Indiana.
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