Narrow Recycled Seed Tray Garland Narrow Seed Tray. Black Brand new for 2010, the Narrow Seed Tray features a strong rim and 2 tier drainage cells. The tray is available without holes as a Narrow Garden Tray - a perfect size for windowsills|Length (cm): 37|Width (cm): 13.5|Depth (cm): 6|Capacity (litre): 2.2