Cottonwood

It has been raining and cold so much this spring.  This afternoon we had some sun and warmth, and the cottonwood trees let all their seeds go.  I had seen a few fuzzy white fluffs floating in the air in the past week or so, but today it looked like snow.  The seeds blew from north to south, filling the air.  I wonder how far they can travel?  We don't have very many cottonwood trees in our immediate neighborhood, so I always wonder where all these seeds came from.  It sure is fun to look out the window and see the currents of cottonwood blowing through the yard, onto their eventual destination.