Bumblebees are increasingly cultured for agricultural use as pollinators because they can pollinate plant species that other pollinators cannot by using a technique known as buzz pollination. For example, bumblebee colonies are often emplaced in greenhouse tomato production, because the frequency of buzzing that a bumblebee exhibits effectively releases tomato pollen. The agricultural use of bumblebees is limited to pollination. Because bumblebees do not overwinter the entire colony, they are not obliged to stockpile honey, and are therefore not useful as honey producers. This photograph was taken in our garden on one of our bee balm plants ( monarda ).that were planted for the hummingbirds. sometimes I think that the bees weigh more than the hummingbirds. . The world's first bumblebee sanctuary was established at Vane Farm in the Loch Leven National Nature Preserve in Scotland in 2008