The herb Mullen was used centuries ago to make wicks for candles. You will have to find the seeds for Mullen and grow them yourself. Mullen is a tall straight plant with a hard stem. When the plant is fully grown and ripe, cut and remove the hard outer stem. In the center of the stem is a vegetable cord- like substance. Remove the cords and twist carefully, tying at top and bottom, then hang with a small weight like a pebble attached to the bottom. You can plait several cords of Mullen together to make the thickness of wick you require. Leave to dry for several weeks, then use in candles as normal.