Stop!: Var., 3 letters
Blue dye, 4 letters
Blue dyestuff, 4 letters
Herb or blue dye, 4 letters
Old World blue dye, 4 letters
Pictish pigment, 4 letters
Any of several herbs of the genus Isatis, 4 letters
Blue dyes, 5 letters
Blue-dye plants, 5 letters
Dye-yielding mustard plants, 5 letters
Small Eurasian shrub having clusters of yellow flowers that yield a dye, 9 letters
Common as weed in England and United States, 9 letters
Sometimes grown as an ornamental, 9 letters