Yield Lab Heavy Duty 10 x 20 inch Propagation Tray - 100 PackYield Lab 10 x 20 inch Heavy Duty Propagation Tray Designed to provide you with the durability you need, the Yield Lab 10 x 20 inch Heavy Duty Propagation Tray is a reimagining of a growing classic. Commonly known as a seed flat tray, this item is perfect for seed and cutting propagation. What sets this tray apart from others in its class is its rigid construction. Nearly three times as thick as a standard propagation tray, this item can hold up to 35