Q.Burning Bush shrub
I planted mine this last spring and they are doing well. However, their fall color is a dark burgundy color. Is there a way I can encourage a brighter red color?
This is likely due to its genetics. Other options will include making sure it receives full sun, and cool temperatures a little bit above freezing. If it is above or below, then the plant may not be as brilliantly colored. These two articles will help:
https://www.gardeningknowhow.com/ornamental/shrubs/burning-bush/burning-bush-care.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/keeping-red-trees-red.htm