I buy the big roll of Clover fusible bias 1/4" strips, all the work is done for you. If I want wider stems/vines I use two lengths side by side. It comes in green, black, gold, silver and lots of marble/metallic colors. tip: if you are machine appliquéing use a twin needle the size to sew the bias tape, perfect space between seam stitch lines.
Here is a link to see most of the colors that you can buy in one pack. That package would last me a life time! I just buy one roll when I need it. Usually about $14 not on sale.
http://www.clover-usa.com/product/0/..._BiasAsst%231_(12-Colors)