This time of year, citrus trees and markets are loaded with mandarins. These easily peeled fruits are smaller than oranges, making the trees more drought tolerant. You know that vitamin C is good for you, but did you know that satsuma mandarins are extremely high in decongestants? The USDA confirmed in 2008 that satsumas are high in synephrine, a natural defense against colds and allergies. Buy mandarins in bulk now, juice them and freeze the delicious medicine for allergy relief come springtime.