A new exhibition chronicles how a paintings conservator and chemist solved a color mystery in one of the painter’s most beloved works.

The common blue violet has a variety of insect pollinators ... These sweetly scented, light-colored flowers bloom in the late afternoon and evening, just in time to attract this nocturnal pollinator.

leaf color can be light green to deep red, variegated, striped, blotched, or speckled. Flowers can be single or double, variegated or solid in shades of blue, pink, white. The growth habit of most ...