Grandma’s Secret Garden, the best 9 plant grow box is best suited for any types of plants especially vegetables and the built-in features of the grow box makes it grow faster all year round. Grandma’s Secret Garden is the ideal grow box for beginners in hydroponic growing. It is a ready-to-use grow system with easy plug and play facility. It can be accommodated anywhere in your house with its dimension of 36″ Tall X 24″ Wide X 13.5 “Deep. It also grows nearly 7 pounds of dried plant matter every year.