Bloodroot, sanguinaria canadensis, is a perennial, herbaceous flowering plant native to eastern North America. Bloodroot stores sap in an orange colored rhizome, that grows shallowly under or at the soil surface. Plants start to bloom before the foliage unfolds in early spring and after blooming the leaves expand to their full size and go summer dormant in mid to late summer. The flowers are produced from March to May, with 8-12 delicate white petals and yellow reproductive parts. The seeds are round in shape and when ripe are black to orange-red in color.
To make dye, you will need to gather the rhizomes. They will produce an orange or orange-red dye.