Springtime is a theme that I've used in my black and white photography (both in my collection of impressionistic note-cards and in my original prints like Springtime in the Greenhouse, which can be seen at the top of this post).
But signs of spring are not limited to first flowers, first buds, or nuances in a greenhouse. Signs of spring are not even limited to temperatures. Signs of spring often appear in subtle ways such as the arrival of spring as seen by E.B. White:
"SPRING ALWAYS USED TO ARRIVE in midtown in the window boxes of Helen Gould Shepard house. Something about the brightness and suddenness of that hyacinthine moment said Spring, something about its central location, too. The other day we passed the Gould House and shed a private tear for olden springtimes. Spring struggles into Manhattan by other routes these days; Rockefeller Center has pretty much taken the occasion over. Rockefeller's is different from Helen Gould's. Less homey. More like Christmas at Lord & Taylor's — beautiful but contrived. One never knows where one will encounter the first shiver and shine of spring in the city. Often it is not in a flowering plant at all, merely in a certain quality of light as it strikes the walls. We met ours quite a while back, late one afternoon in February, driving south through the Park; in an instant the light had lengthened and strengthened and bounced from the towers into our systems, hitting us as a dram of tonic reaching the stomach, and, lo, it was spring."