@article{Denisow_Tymoszuk_Dmitruk_2019, title={Nectar and pollen production of Helianthus tuberosus L. – an exotic plant with invasiveness potential}, volume={78}, url={https://www.abc.botanic.hr/index.php/abc/article/view/2510}, abstractNote={<p>In Central Europe, Helianthus tuberosus L. is a late summer/autumn bloomer (August/November). The disc florets produce both nectar and pollen. Floral reward is available in male-phase flowers (pollen and nectar) and in female-phase flowers (nectar). The floral reward is attractive to a variety of insect visitors (honey bees, wasps, flies and butterflies). The season of blooming as well as the total sugar yield (25.4 – 47.4 kg ha–1) and pollen yield (57.8 – 212.7 kg ha–1) indicate that H. tuberosus is important in the enhancement of food resources for pollinators. The generative reproduction in H. tuberosus is impaired (the species does not set seeds/fruits). However, due to its attractiveness for a variety of pollinators in both rural and urban areas, the spread of H. tuberosus should be monitored. Moreover, its propagation needs to be attended with restrictions.</p>}, number={2}, journal={Acta Botanica Croatica}, author={Denisow, Bozena and Tymoszuk, Karolina and Dmitruk, Marta}, year={2019}, month={Oct.} }