Most giant puffballs grow to be 10 to 50 centimetres (4 to 20 inches), sometimes to be 90 cm (35 in) in diameter; although occasionally some can reach diameters up to 150 cm (60 in) and weights of 20 kg (44 lb). The inside of mature Giant puffballs is greenish brown, whereas the interior of immature puffballs is white. The large white mushrooms are edible when young. The fruiting body of a puffball mushroom will develop within the period of a few weeks and soon begin to decompose and rot, at which point it is dangerous to eat. Unlike most mushrooms, all the spores of the giant puffball are created inside the fruiting body; large specimens can easily contain several trillion spores.