By Mikwatki
United Kingdom 
In Spring 2009 I planted an Arbutus marina in my garden, all was well till the severe winter of 2009/2010 when it died. I bought a new one and planted it as before, it flourished and even fruited but during the winter we have just had the same seems to have occurred again, any ideas?
6 Mar, 2011
Answers
According to a US website I found, it's supposed to be hardy down to 15F = -9 C. You haven't filled in where you are, but lots of places in the UK were down to those sorts of temperatures in the last two winters.
6 Mar, 2011
Hi Mikwatki,
Arbutus 'Marina' is a hybrid developed in San Francisco - I visited the (now truly enormous) original plant a few years ago.
Although it is certainly hardier than it's California native parent - Arbutus menziesii - it is far from fully hardy here in the UK. I know of several that were killed this last winter, despite being in very sheltered gardens, and would be surprised if any survived outdoors in the UK without great protection, given the temps of last December. We gave up trying to grow it here some years ago as the plants couldn't make it through even mild winters outdoors.
I'd recommend you replace with either Arbutus x andrachnoides or (if you want the pink flowers of 'Marina') A. unedo 'Rubra', both of which are considerably hardier.
6 Mar, 2011