So I've had N. x leessii for almost a year now. Grew it in lowland conditions for 8 months, and saw nothing from the plant in that time. Four months ago I moved it into my highland greenhouse, and it has taken off!! It would seem this true lowlander was born a highland. It just opened it's first pitcher after a year in my care. It's pitcher is one of the largest in my greenhouse, which isn't saying much.. but I am truly in love with the plant.