Do you cut these plants off at the end of the season or leave them on over winter?
The Gaura Plant
Certified GKH Gardening Expert
Many people find that it tends to grow better the next season when it gets cut back. It will be fine to leave it, but for the best results it is safe to cut it back.
Here is an article that will help: https://www.gardeningknowhow.com/ornamental/flowers/gaura/growing-guara-plants.htm