If a girl says to grow grass, you can reply according to the specific situation:

1. If she says she wants to buy something, you can answer "Buy it if you like, no problem."

If she mentions that she wants to plant flowers and grass, you can reply, "Good idea, planting flowers and grass can bring a lot of fun. I can provide some suggestions and skills to help you realize this wish better. "

If she refers to a product or service, you can answer, "Why not try it?" ? You can try it and see how it works. "

In a word, you can encourage and support the girl to plant grass, or provide some useful suggestions and help to make her realize her wishes better.