Thank you for your lovely message. Wish I could tell you more about the grapefruit tree but I am still fairly new to all this. I am assuming that because it is in a small courtyard with high walls all around it, the frost doesn't affect it. I've seen beautiful orange & lemon trees here in our village too, but all the time protected by high walls around them. Normally citrus fruits grow further south in Spain where the climate is hotter, so I suppose the walls fix this problem here.
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Yes , the walls that usually are built on the north side of the tree are called sun catchers . Maybe this year I'll try to make one of these and plant a citrus tree . For the cold winter in North-East of Bulgaria is almost impossible to grow citrus fruits. But my favorite part of the life in the village is the experiments, this is the best way to learn from nature :) Thanks for sharing :)