This isn't rare but it does grow in bogs and swamps usually where the sphagnum moss is dominant. It is an insectivorous plant which is a shy flowerer. Small flies are caught in the glue tipped sticky hairs on the leaves and digested to supplement the nitrogen poor habitat. It can tolerate quite acid conditions and I have seen it flourishing in bogs of measured acidity less than pH 3. (pH is a measure of the acidity and is roughly defined as minus log to the base 10 of the hyroxonium ion activity - but you knew that).
You can cultivate Drosera in tissue culture (an agar medium) and it likes it even better than bogs on rain soaked acid moorland.
Cwm Idwal 25th July 2002
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Amended on January 24th 2005