Hygrophila lancea "Araguaia" This low growing variety of Hygrophila grows reddish brown to purple leaves that are short and very narrow, with a lighter coloured central vein along the length of each leaf. Topping each stem helps side shoots form to maintain a bushy appearance. Hygrophila lancea Araguaia is moderately difficult to grow, requiring bright lighting and regular fertilisation with CO2 injection also recommended.