The reproduction modes of the following organisms do not belong to vegetative reproduction: () A. Germination of potatoes B. Cutting with branches of willows C. Germination of apples D. Growth of grape seeds. A, potatoes germinate and grow into new plants, which belongs to vegetative propagation. A is wrong;

B, willow cuttings, which are propagated by plant stems, are new individuals directly produced by vegetative organs without the combination of bisexual cells, belonging to vegetative propagation, and B is wrong;

C, apple bud grafting, is the use of plant vegetative organs to reproduce offspring, which belongs to vegetative reproduction, C error;

D, grape seed seedling or seed reproduction? After the combination of bisexual germ cells, it belongs to sexual reproduction, and D is correct.

Therefore, choose: d.