While these flowers might not sound too harmful, they can affect other plants as well as insects and birds, according to ...

The 1,800-plus species and hybrids of the begonia family (Begoniaceae) give gardeners a wide selection of flower colors ... make copies of the original plant when placed in water or damp soil.

It’s best to allow begonia stems to fall away on their own as breaking them off prematurely can damage a tuber’s growth ring.