JIFFY - SEEDLING TRAY 104 CUBES - 53X31X5The 104 cubic Jiffy germination tray measures 53x31 centimeters and is therefore suitable for the measures of the most common serrette on the market. Each plug is 5 cm high instead of the classic 3. 6 cm to ensure a better and more complete development of the root system. The substrate is added with a polymer that guarantees the classic spongy porosity, so as to guarantee a minimum of 30 35% of air even at water saturation. The plugs arrive wet and