Water patio containers & baskets weekly instead of daily! Simply include these unique & ingenious water-absorbent mats in the base of the container at planting time, & they'll provide a permanent reservoir of water for plant roots (which can actually grow into it). Each 18cm (7) square mat holds up to 1 litre (2 pints) of water! Mats last for at least one season & can be simply cut to size. (3 Pack of 4 Mats.)