"Les linfoot" wrote in message
...
If it was fatal for
Socrates, is hemlock OK for my cryptomeria?

It's not the same hemlock. Not even close. The hemlock Socrates drank was
Conium maculatum (http://www.ansci.cornell.edu/plants/conium.html ). "Your"
hemlock is a tree of genus Tsuga
(http://www.botanik.uni-bonn.de/conifers/pi/ts/ ). I think it's bark would
be OK for your cryptomeria.