A 9x9 grow bag typically refers to a gardening container used for growing plants, such as vegetables, herbs, or flowers. The "9x9" size usually describes the dimensions of the bag, meaning it is 9 inches in height and 9 inches in width, though sometimes this could refer to the diameter if it's a round bag.

These grow bags are often made from breathable fabric, which allows for better air circulation around the roots and helps prevent overwatering. They are portable and can be used for both indoor and outdoor gardening. They're popular for growing compact plants, such as tomatoes, peppers, lettuce, or flowers, and are especially useful for container gardening or small spaces like patios, balconies, or balconies.