Garland 28 Cell Deep Root Plant Cells G229. Uniquely designed 'split cells' allow easy inspection of root development and zero root disturbance when plants are removed for transplanting. Deep cells (12cm) feature internal ridged sides to encourage healthy downward root development. Each cell features a central drainage hole and 4 side ventilation slots ensuring excellent drainage and beneficial air pruning of the root system. Size Check: (each cell strip) 21cm (8.25") Long 5cm (2") Wide 12cm (4.75") High. Suitable for use with the G227 28 Cell Deep Root Success Kit. Ideal for all plants with deep roots.