Also called curly endive, frisée grows on a head like other greens. The leaves are green on the outside and paler and yellower on the inside. Leaves resemble ferns, with a lot of bifurcation (process of dividing something into two independent branches) which gives it a frizzy or curly appearance leaves resemble ferns, with a lot of bifurcation which gives it a frizzy or curly appearance.