Sweet potato vine


What is the green leaf in the planter in the attached photo called?
Thank you, Lina.


The plant is Ipomoea batatas, Sweet Potato Vine.  It is a tender perennial that is winter hardy to Zones 9. In Toronto it is widely grown as an annual.  It is a great container plant, easily grown in average, medium, well-drained soils in full sun. Best leaf colour (which ranges from lime green to purple) usually occurs in full sun.