Solidago fistulosa (Pine Barren Goldenrod)6-8t; allow room for spreading; attractive large yellow flower heads in late summer-fall; goldenrods are among the most important late-season pollinator plants. Honey bees feast on goldenrod nectar before winter. Butterflies and many other pollinators rely on goldenrods as a major food source. Beekeepers often use goldenrods as the primary food source for winter. Some sources report that goldenrod nectar has an average sugar concentration of 33%.