Hatching box made of cardboard is used to store cocoons of bee solitary. Cocoons stored in a cardboard box have ideal conditions to look great in spring. After breaking the security, the hatching bees can leave the box freely. It should be remembered that the cocoons should be stored in a cool room with a temperature close to the temperature close to the outside, without access of rodents and not too high humidity (the cocoons can get mold). After getting out, you have to take out the box with the remains of cocoons and burn. In parasitic cocoons parasites may remain, which start their activity at the end of May and in June. They are single boxes - in order to enjoy large population increments one should be careful and minimize the possibility of transferring parasites (eg mites) to subsequent generations.