Strike a blow for greener cities and help nature to take control of your tiny tower block town. Encourage the undergrowth to rise up and envelop the buildings. In two weeks exchange a bare urban landscape for a rich forest of foliage.

City PostCarden is enjoyable for all ages all year round - send one to a friend and brighten up their mailbox! Simply open and build into its urban landscape, place on a tabletop or windowsill and add water. In a matter of days your card will start to grow and will keep for 2 - 3 weeks.

The front illustration is by Millie Harvey.