
“To make the wheels, artist Sasha Duerr collected local plants from these regions throughout the year to create natural dyes, using various mordants (chemicals used to set dye) to manipulate the colors.”
source (https://botanicalcolors.com/shop/gifts/the-seasonal-color-wheel-by-sasha-duerr)
via (https://www.nytimes.com/wirecutter/gifts/best-plant-gifts)