Explain why there are no or very few tall trees in an abandoned farm field in the first decade after the field is no longer farmed.

Explain why there are no or very few tall trees in an abandoned farm field in the first decade after the field is no longer farmed. During the first decade after these farm fields had been abandoned, most of the area was covered by herbaceous plants that grow and reproduce rapidly and grow well in full sun.

the answer u all are looking for is 4000000000000000000000 million years.