Water patio containers and baskets every 7-10 days, not daily! Before planting up, cut to size and pop these clever mats in the base of the container. Once watered the season long lasting mats will absorb 1 litre/2 pints to provide a permanent water reservoir for plant roots which can also grow into them too. Each 18cm square rain mat holds 1 litre (2 pints) of water and is ideal for tubs and hanging baskets cutting watering by up to 90% watering only every 7-10 days.