Well, Cyprepedium acaule is know to be poisonous. But what are the chances that that is the orchid you mean to use. As for the other orchids, I don't know anything about their toxicity. Never heard of any.
Are you talking about just cutting a flower stem and putting that in the water?
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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