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Pietaryrtti, nappikukka (in Finnish there are lots of other names
for this yellow flower! Nappikukka = button flower)
In England, bunches of Tansy were traditionally placed at windows to keep out flies.
Sprigs were placed in bedding and linen to drive away pests.
Tansy has been widely used in gardens and homes in Melbourne, Australia to keep away ants.
It is also used by some traditional dyers to produce a golden-yellow pigment. The yellow
flowers are dried for use in floral arrangements.