Using plant material to produce natural dyes is akin to cooking. Both use recipes. Each involves both creativity and standardization.
Modern, commercial dyes came about through the invention and production of coal oil and observations surrounding it. These dyes were eventually produced to consistent standards by highly trained technicians. Repeatability and predictability in industrial textile settings were their goals. On the other hand, home dyeing with plant materials offers a latitude in creative outcomes that is unique and unrivalled through commercial dyes today.
This drop-down lists some of the components used in home dyeing. There are countless ways in which the home dyer may combine them. The opportunities for experimentation and creativity are endless. Have fun!