The natural regeneration of American oak and pedunculate oak under cover occurs regularly in the Aelmoeseneie forest. Nevertheless, these seedlings tend to establish very difficultly. They often die off after one year. In order to survive, the crown cover has to be strongly opened after the first year. One year old seedlings of American oak, however, grow slightly better under cover than under partial freestand. The seedlings of pedunculate oak, on the other hand, hardly react on the different light conditions. The American oak seeds are of good quality. A considerable amount is eaten by the birds. The seeds of pedunculate oak are of a minor quality; an important number is eaten by the worms. The growth of the seedlings in the Aelmoeseneie forest does not always correspond to the growth on other sites.