activity bee bright bumble flower insect light pattern petals pollen summer sun wing yellow annual appearance black bloom cluster color colors colour colours composite-flower contrast contrasting dark flora flowers gold golden Helianthus inflorescence kernels large large-head plant plants popular radiant seeds seedy spiral spiralling-florets sunflower sunflowers sunlight sunny sunshine widespread agriculture clouds cloudy field green overcast sunbeams sunburst sunset blossom ecology environment fondo green energy hintergrund indian summer petal sommer sonnenblume symbol