Eucalyptus leaves are the favorite food of Koala Bears.  Put a handful of the leaves in a pair of panty hose.  Place them under the spout of hot water shooting into your bath.  Resulting infusion is relaxing, comforting, a decongestant (as inhaled) and anti-microbial.

Eucalyptus tea as an antiseptic gargle and breath freshener.

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Found in southern California, numerous species, many infected and dying on the west coast.