I picked the fern and used it to hammer this image into my fabric - it worked surprisingly well and color and pattern transferred nicely! The whole process is a bi laborious, as you need to lay the plant, face down, on your fabric, masking tape it on in layers and then hammer it down (I used a rubber maillot, providing a larger surface area with which to pond). I then turned the garment over, making taped side down now, and ran an iron over it to heat set the plant 'dye'!
Logwood + iron, Dye Recipe Dye Color test by tinateaspoon, Natural Dying inspiration for CAPI students at milliande.com , Dye Color Tests with Natural materials, herbs, Plant dyes for Paper, Fibre, Wool , Cloth and Textiles
Have to try this! Silk bundle with herbs to stain the fabric..... mordanted with alum; layered with petals; wrapped; steamed for about an hour; left to dry in the sun for about a week; rinsed, dried and ironed to fix the colors