When people ask me what’s my favorite time of the year here in Athens, I always say it’s spring and particularly April. That is when all the Seville orange trees lining the streets of Athens – both downtown and in the suburbs – blossom and perfume the whole city. I can spend hours walking around and inhaling the wonderful scent. The common orange is believed to be a naturally occurring hybrid between the pomelo and the mandarin. There are many different varieties and other hybrids that have evolved, but they generally fall into one of two categories: sweet (citrus x sinesis), which includes varieties such as the navel orange, the Valencia orange, the blood orange and the Jaffa orange, or bitter (citrus x aurantium), which includes the Seville orange, the trifoliate orange and the bergamot orange.