What does it mean to plant three trees in front of the door and the family will prosper for three generations?

Uncle? Not the specific three kinds of trees, but the general. Similarly, what about the latter? Three generations? Not a real number, but also a generation. Therefore, the old saying means that if you plant a few trees in front of your house, it will bring you good luck, and your family will be prosperous, and each generation will be stronger.