Cold weather, including frost, can cause onion plants to bolt, meaning to produce a tall stem and flower. Onion plants that bolt have smaller bulbs and do not store well.
About the Author
Sandy Mitchell is an Ohio-based writer, blogger and editor. She writes for "The Better Drink" and other online publications. Before devoting herself full-time to writing, Mitchell was a travel agent and cruise school instructor for 18 years. She holds a Bachelor of Science in business administration from Bowling Green State University.