These are the dried leaves and seeds of Isatis tinctoria, also called woad (/ˈwoʊd/), dyer's woad, or Jerusalem Asp. In France it is called pastel and in German Waid. In Dutch we call it wede. 
It is a flowering plant in the family Brassicaceae, a biennal herb up to 1.60 meter tall. Woad is also the name of a blue dye produced from the leaves of the plant. Our woad leaves are organic, and are cut at the height of their season together with the black seed heads.  If you would like to grow your own woad you can easily pick them out of the mix.
 
Woad contains indigotin, in the form of isatan A and B but in lower percentages than the regular indigofera plants. 
 
You can also create a fermented vat with these woad leaves.
Another way of using dried woad is making a regular dye bath in boiling water with the leaves, for pinky tans. 
 
This woad works best as a fabric dye on protein fabrics, and is not fit for use in soaps.