During these seasons, Black Truffles grow at their best ranging from 7 to 9 centimeters in diameter and could weigh from 80 grams to 100. Because of the rarity of this mushroom, the production of Black Truffles has been made almost exclusively in the European countries. Black truffles are sold for about 1,000 per kilo when bought in the farmer's market. This truffle is not really white in color; it is actually yellowish. Winter black truffle - Native in European countries like France, Italy, and Spain, the winter black truffle is typically harvested between November and March. It is also called the black diamond of Provence or Perigord truffle. People mistakenly consider the French black truffle the best of all black truffles, though actually no truffle from a particular country is better than the others. Brush truffles with soft brush to eliminate soil deposits and then cover each truffle with dry paper towel to seal their natural flavor. Place the wrapped truffles in an airtight jar and store it in the refrigerator. Don t store them in room temperature. Truffles with pungent flavor such as winter varieties can be stored in whole eggs or uncooked rice that can absorb excess flavor. Winter truffles during November to February, White truffles during October to December Oregon truffles from mid-December until the middle of March. Perigord truffles from December until February Burgundy Truffles from October until January. The truffles should not reach beyond this point. They would develop a disagreeable odour and they become spongy and dry. There are different varieties and may look different based of their kind. So be familiar with the different kinds of truffles. There are some mushrooms which may look like truffles but are actually poisonous. So be cautious, especially if you are not really that familiar with mushrooms. Before you eat a mushroom you have unearthed somewhere, consult an expert first if it is indeed safe to eat. In Middle Eastern countries, people gather various truffles after rainfall. These include the brown kame, black kame, Terfezia claveryi, and Terfezia bouderi. The sad news about truffles is that they are dwindling in quantity. Recently, only 25 to 150 tons of truffles are harvested every year. Many decades ago, harvest of truffles total to hundreds or even thousands.