of course pollination is important. Does anyone else plant flowers in the garden to attract bees and other pollinators? This is the only reason I plant flowers! Mammoth sunflowers are good because they stand up tall (above my privacy fence) and can be "bee" seen from far away
other flowers with a very showy or fragrant display are great for getting bees to the garden. My usual practice is sunflower (mammoth and a short variety), Sweet Peas (high scent), Zinnias (mixture of varieties) and marigold. There are always a bunch of bumble bees, honey bees, bee flies, butterflies, and dragonflies in the garden. Especially if you get out there just as the dew is burning off in the morning sun.