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Plants are simply placed in boiling water and simmered. Soaking overnight is also useful. Bought dried stock like madder is useful for plants not easily found in UK.
To achieve white or cream space designs on the dyed cloth the area has to be resisted. One resist method is clamping, another is tying with string or rubber bands; to prevent dye penetrating to fabric. Fabric composition affects dye penetration. The lace on the left is obviously not natural, but an acrylic or a polyester, with a small amount of cotton which takes the dye.
Oak galls surprisingly made a good light brown, a pleasant coffee caramel, which would go with other colours. Folding and clamping make a good resist for white or cream designs. Triangles of wood can be used and clamped to form a 'resist' to the dye penetrating. See my hand printing Ideas Pinterest Board showing many examples of Shibori