There are a multitude of ways to use natural dyes: immersion, block or screen printing, painting, etc. Lately I've been experimenting with eco-printing, sometimes also called contact printing. It's a labor-intensive process where I wrap, bind and steam plant materials directly into the treated fabrics, usually for hours at a time, to create a permanent print. I've seen a lot of interesting and exciting examples of this method, but they were also not quite my particular style. I was aiming for something that felt connected to antique botanical charts, or the pressings of flowers between journal pages. I wanted something nostalgic and romantic, but also evocative of scientific botanical illustrations from the 1800s, particularly the nature printed seaweeds by Henry Bradbury (I have a collection of these prints I found on Ebay several years ago).
After a lot of experimentation and failures, I finally started to consistently pull clean prints that fit my aesthetic goals. To get to this point, I tested several kinds of fabrics and tweaked a lot of the chemistry involved, such as the percentage of and delivery method of various kinds of mordants, the water pH, and balancing the need to protect the silk from becoming brittle from various mordants while drawing out the desired colors from the plants.
I currently have one eco-printed item available in the shop, with more items to come: http://www.honestalchemy.co/new-products/leaf-print-table-runner