I have overwintered a Raja Puri without winter protection and it bore fruit mid July 2009. Carmichael, CA.
Winter temps near or below freezing but warming to the mid 40's to 60's during the days. Coldest night was 27 degrees.
I cut the leaves off and laid them around the base of the plant to repell water and keep the soil drier. It sits on the south side of a row of 6' tall Mandarins, and gets some wind protection.
Pics in my album of it in full bloom!
