The largest block ever produced by Grodan, the Big Mama measures 8" x 8" x 8" and contains well over twice as much wool as the popular Hugo block. This block is big enough to grow a large plant for its entire life. When a plant outgrows its current block, gardeners can simply place it on top of the Big Mama. This block does not have a precut hole, making it suitable to hold any size smaller block on top.