The more you propagate your indigo (indigofera) plants, the more dye it can give you. This is one easy task as indigo propagation starts from seed, whether it's indoors or outdoors. Another method of propagation is through cuttings which should contain at least 3 leaves wherein you can water them or by simply applying potting mix. If propagated well, not only it can provide indigo dye but its leaves can ease inflammation caused by insects bites or stings.

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Source: Gardening Know How