Hibiscus moscheutos "Luna Red", Rose Mallow
This cold hardy hibiscus is very attractive with its huge flowers, up to 20 cm diameter. You will find different information on the internet, but according to our 10 years experience with this plant in Bulgaria, its leaves and branches live one season and the rhizome survives about -18°C air temperature. At lower temperatures at least a small protection is needed to insulate the ground from deep freezing.
The pictures are from our experimental field near Assenovgrad, Bulgaria, where the plants grow in a very limy soil. If planted in a better soil, they will produce bigger number of larger flowers.
More information is available on our forum:
USDA zone:-18°C (zone 7a)
Sun exposure:Sun or shade
Soil pH+:slightly acid (pH 5,5-6,5)
In Open Ground:No protection