This is something I *can* help with...frost does settle in low areas, and
the description of your garden makes me think it will be badly affected, the
lower spots more so. If you can't move it, put more sensitive things higher
up the slope, and a hessian sack/old sheet/old blanket can be used to
protect new growth. Stone walls can be used to store heat during the day,
and reflect heat at night. If you put a stone wall at the lower end of the
slope, it will give those plants some relief. Also try and make sure your
garden bed isn't in shade during the winter afternoons. Anyway, just some
tips Look for frost friendly plants as well, frost will improve plants
like that.