Should You, & How Short, Prune A Iochroma After Frost?

Question

I have a Royal Purple lochroma that did fantastic this summer in full sun in the ground. I live in Zone 8b (NE Vancouver, WA) & the leaves died with the first frost. Should I prune the plant back or let it be? So far, the stem are good.

• 

Answer 1

If the stems do not die back, just lightly prune it for desired height. If the stems die with a few hard frosts, you can cut it down to a few inches from the ground and it will resprout in spring.

https://www.gardeningknowhow.com/ornamental/flowers/iochroma/iochroma-plant-care.htm