Blood oranges got their name from the deep red color of their juice and fruit. They are usually very sweet and delicious. I love them. For a great article on the virtues of blood oranges, look no further than Simply Recipes by my friend Elise.
Our tree produces lots of fruit, but I am sad to say they are uncharacteristically sour. When we first moved into this house three and a half years ago, the neighbors said "That tree has bad fruit." Of course I thought that was absurd! How could a blood orange tree have bad fruit? But although I eat the fruit, I must admit it is barely edible.
I blame myself. Surely we must not be feeding or watering the tree correctly? Or perhaps the soil in our garden lacks some essential nutrient. In any case, I refuse to admit defeat. I am feeding it with citrus food, beginning a program of slow and deep (but not too frequent) waterings. I'll let you know how it all turns out.