When kabocha is just harvested, it is still growing. Therefore, unlike other vegetables and fruits, freshness is not as important. It should be fully matured first, in order to become flavorful. First, kabocha is ripened in a warm place (77 °F/25 °C) for 13 days, during which some of the starch converts to sugar content. Then it is transferred to a cool place (50 °F/10 °C) and stored for about a month in order to increase its carbohydrate content. In this way the just-harvested, dry, bland-tasting kabocha is transformed into smooth, sweet kabocha. Fully ripened, succulent kabocha will have reddish-yellow flesh and a hard skin with a dry, corky stem. It reaches the peak of ripeness about 1.5–3 months after it is harvested.