These curtains have a deep bottom hem to weigh them down and help them hang well.

Make a 3-inch deep fold at the bottom of a panel and press it. (This fabric is directional so you want to make sure you're doing this at the bottom of the panel and that the branches will be right side up when you hang it!) 

Make another 3-inch deep fold and press it again. 

Pin this double fold down and sew it with a 1/4-inch seam allowance. 

Repeat for three remaining panels.