Black Knight Scabiosa
Scabiosa atropurpurea
 
Black Knight Scabiosa, or Purple Pincushion, is of my favorite dye garden plants. This deep purple colored variety dries perfectly and has quite a bit of color potential - just a handful of blossoms can create incredible color especially when used in bundle dyes. Depending on mordant choice and acidity of the dye bath, colors range from slate grey-blue and green, to saturated tones of teal, to purple and pink. 
 
Add the flowers to the dye pot, cover with water and simmer for 30 minutes to extract the color. Strain the dye liquid and return to the dye pot. Add fibers and simmer until the desired shade is achieved, generally 30-60 minutes. Each bag of dried flower is 28 grams and will dye 60-80 grams of fiber. Color fastness: good