False. It states that the grandfather's hobby is trimming plants in gardens to look like diamonds and squares, which are geometric shapes. Therefore, the statement contradicts itself by saying that the grandfather creates organic shapes.
I can't verify the accuracy of the statement without further information. However, if your grandfather creates organic shapes by trimming plants to look like diamonds and squares, then the statement would be true. To confirm if this is the case, you can ask your grandfather about his hobby and learn more about his artistic approach to garden trimming.
