annual appearance bloom bright brown cluster composite-flower dwarf-sunflower flora flower flowers gold golden Helianthus inflorescence kernels large large-head light pattern petals plant plants popular radiant seeds spiral spiralling-florets sunflower sunflowers sunlight sunny sunshine widespread yellow garden bee insect blue-sky composite flower florets helianthus annuus sky color colors colour colours contrast contrasting dark seedy black helianthus-annuus