Answer to the Front Page Picture of the Week Question
for October 12th - October 22nd, 2006
This is Japanese roof iris, Iris tectorum.
Although it is naturalized in Japan, it is native to China, where it was
planted in thatch roofs to help bind them against strong wind. It is one of
the most shade tolerant of all irises. Iris tectorum is an example of the great
diversity of exotic Iris species coming into the nursery industry. Flowers
appear in late spring and come in lavender, blue, or white. You can grow
Japanese roof iris in moist well drained soil, for example, around ponds and
fountains, and is hardy in USDA
Hardiness Zones 4 through 9. You can find it growing in the Japanese
Woodland in the Asian Collections.