Final answer:
The date of the tree planting on the Goodall farm is not provided in the given information.
Step-by-step explanation:
The Tree Planting on the Goodall Farm
The date of the tree planting on the Goodall farm is not provided in the given information. The information mentions Jane Goodall's discovery of chimpanzees making tools in 1960, but it does not mention a specific date for the tree planting on the Goodall farm. Therefore, we cannot determine the exact date based on the given information.