Soils and flower color
Tim Eck (Tue, 12 May 2015 10:54:43 PDT)

I know that some dicot floral pigments are sensitive to reduced iron in the
soil, making the difference between reds and blues.

Tim Eck

When a philosopher says something that is true, then it is trivial. When he
says something that is not trivial, then it is false.
Gauss