Gil - Thanks for that.  I'm sure that it is iron (clean spring from old
mine, little vegetable matter to provide tannin) but it certainly doesn't
seem to do any harm - it's a helluva job clearing unwanted plants from the
waterway downstream of our watercress bed.  I once thought it might be a
good idea to plant Mimulus, now I struggle to clear and compost it before it
seeds - looks pretty in flower, though.
                                                 Tony N-S.

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