The Houseplant for this summer month is the Mother-in-law’s tongue, also known as the Sansevieria. Each month a different plant is given the centre of attention as Houseplant of the month. Why don’t you join in? You can download some POS material for your shop, underneath The story of the Mother-in-law’s tongue Mother-in-law’s tongue is one of the easiest houseplants. The plants have rootstocks, out of which thick, tall, sword-like shape leaves with succulent characteristics grow.