Sue, putting the box downside will sure work, sorry I wasn't clear at all!
I was thinking about a cold frame only if it should freeze. Again, next winter to me it's unpredictable. We were used to get freezing nights and mornings almost all winter long, but in two years things changed a lot. Mild winters, lots of rain, and not so hot summer with lots of rain too. In the past two years I remember it frozen just one night.
This past summer was very hot and dry instead, so who knows what kind of winter will come?
So I'm not sure I chose my climatic zone well. Weather is really crazy here and seasons are no longer the same.
The past mild winter only Stella de Oro lost all foliage as I was expecting, the others kept some leaf here and there. I only have registered cultivars, Stella is the only dormant, the others equally divide in SEV or EV.
They are quite new to my garden, Stella was planted in august 2013 and the others in march 2014. I don't know them very well yet.
My crosses are both a SEV x EV.
