Basic Plant Phys questions

Janice M. Glime jmglime at MTU.EDU
Sun Nov 29 12:39:06 EST 1998

Hmm...  Keeping Poinsettias in total darkness is probably only because
places where humans grow poinsettias are usually subject to human
intervention with the light - street lights, house lights, etc.  I know
that one street light will keep them from blooming, but total darkness
does not exist in their native habitats - they are not under snow for
months.  In Florida they bloom, and the moon shines there.  It is
reasonable to assume that the red light of our artificial light is the
source of the problem, but that moonlight is not.
Does anyone know the actual spectrum of moonlight?  Is the lack of color
simply its inability to stimulate our cones due to low intensity, or is
there really an altered spectrum?
 Janice M. Glime, Professor  
 Department of Biological Sciences
 Michigan Technological University
 Houghton, MI 49931-1295
 jmglime at
 FAX 906-487-3167 

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