Nectar and pollen production of Helianthus tuberosus L. – an exotic plant with invasiveness potential

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Abstract

– 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.

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Denisow, B., Tymoszuk, K., & Dmitruk, M. (2019). Nectar and pollen production of Helianthus tuberosus L. – an exotic plant with invasiveness potential. Acta Botanica Croatica, 78(2), 135–141. https://doi.org/10.2478/botcro-2019-0019

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