This tray is really a mini capillary table which will keep potted plants watered for up to 14 days the unit features a base reservoir tray which contains a stilted inner support platform which is covered in capillary mattingr r the base tray provides a reservoir of 8 litres of water by ensuring that compost exposed at the bottom of plant pots is in contact with the capillary matting the plants will water themselves invaluable for keeping plants watered for those going away on holiday the