A simple procedure one can do at home; of spreading dye giving seeds and petals on silk (sprayed with vinegar). Fold pieces, then tie into bundle with string. Most petals will produce colour.
Keep seeds and petals in jars, ready for distributing. Some seeds like Hopi Sunflower have strong dye power, like deep purple.
[Pages restructuring in progress 2020: additional images to be RESIZED]
Plant dye workshop was run by Flora Arbuthnott at Forde Abbey Garden Festival 2017. Details of flora's work and workshops below:-
Natural dyeing, bundle dyeing, organic indigo dyeing, japanese shibori resist techniques, natural mordants, colour foraging Walks. http://wilddyegarden.co.uk/
Magazine feature http://www.floraarbuthnott.com/country-homes-interiors
Flora's 'Wild Dye Garden' on Instagram: https://www.instagram.com/wilddyegarden/