Love that blue? An article from Instructables offers directions on how to grow your own indigo.
From the article:
The allure of indigo has always fascinated me. I've purchased blue powder and dyed yarns in the past, but always wanted to do some batik fabrics. This was the year. And to actually grow the plants that will produce the color blue. Blue is elusive in the plant world, a few flowers like forget-me-nots or hydrangeas are blue, but you can not extract a blue dye from them. There are several plants that contain the chemical indican from which you can produce a blue dye. They include woad, dyer's knotweed, Indigo tinctoria, and I. suifruticosa. I planted dyer's knotweed (polygonum tinctorium), as it was the easiest to obtain seed, and also to grow in my area of the Midwest.