Hidden Treasure

Once upon a time, a farmer had three sons. The farmer was rich and had many fields.
When the farmer was dying, he called his three sons to him. "I have left you treasure which will make you rich", he told them. "But you must dig in all our fields to find the place where the treasure was buried".
After the old man died, his three lazy sons went out into the fields. They began to dig. "I'll dig the first to find the place where the treasure was buried", cried the eldest one. "That's the field where our father put the treasure", said another son.
The three sons dug all the fields for several years, but they found no treasure.
However, many plants grew in the fields because the sons had dug. The vegetables made them very rich.