Japanese Maples in zone 4
I live in La Crosse, WI---zone 4B, but often enough 4a. I hear that a few varieties of Japanese maples are hardy in Minneapolis, which is definitely in zone 4. When I hear questions about Japanese maple hardiness in zone 5 or 6 I wonder under what conditions or just what varieties have been tried. Last winter was bitterly cold here. It bottomed out at -26 degrees. Most of the Japanese maples in our river valley city survived with no-die back. These were 'Bloodgood' and 'Emperor 1'. A few did die completely. Over the past 25 years I have experimented with Japanese maples in this area. I have lost more than a few, but another that has survived for six years here (and some gnawing by rabbits) is a mounding laceleaf variety, I think it is 'Red Dragon'. At a former residence a huge JM leafs out year on end. It is at least 12 years old, in a protected area quite near the foundation of a house with a heated basement, and has survived temperatures of -30F. It looks like a atropurpurum variety, but I have little more information as it was purchased at a Walmert in Manchester, Iowa. Again, as has been noted in other blogs, certain varieties of JM are much hardiest than what is imagined. When it gets cold here in late November or December, it stays cold until March. We usually have snow cover, but not always. For months on end we do not get warmer than the 30s.