Judy Glattstein
Mon, 09 Apr 2007 10:32:56 PDT
My understanding is that while chlorophyll = green is the primary 
photosynthetic system plants utilize, there is a secondary route that 
uses yellow. Thus yellow variegated plants grow reasonably vigorously. 
White being the absence of pigment, white variegated plants are less 
efficient, grow more slowly, may revert to all-green - Hemerocallis 
'Kwanso' and Kerria japonica 'Picta' as examples.

Also, variegated plants fertilized with additional nitrogen may change 
to all-green. Not certain if this applies to yellow-variegated, 
white-variegated, or both.


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