Question
QUESTION: In zone 5, most spring flowers are yellow or white.  I have always wondered what is the reason for this?

ANSWER: Hi Liz,
Thanx for your question.  It must just be your perception.  Spring flowers run the gamut of colors.  Hyacinths, tulips and crocus come in purples, blues, pinks, bicolors and even daffodils come in pinks and oranges.  Redbud and magnolias come in varying shades of pinks and purples.  Muscari and grape hyacinths in blues and pink.  Virginia bluebells and monkshead in blues and purples.  I hope this helps.
Tom

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QUESTION: Hi Tom,
Thanks for getting back to me.  I meant that the first to pop up, like Winter Aconite and Snowdrops.  The first daffodils to bloom for me are always the solid yellow ones.  Also, the first primrose to bloom for me is yellow and the first daylily to bloom for me is yellow ("Saratoga Springtime").  I know that other colors come into play, but I was wondering if anyone has made the connections with yellow and white.  On a side note, I didn't know that muscari came in pink, I just grow a blue version.

Answer
Hi Liz,
I never really thought about the colors.  I'm not aware of any particular studies but like I said, it never really came to mind before.  I did do some research but I could not find anything that spoke to any peculiarity regarding yellow and white as predominant colors of first emerging spring flowers.  I'm sorry I could not be of more help.
Tom