Arborvitaes

Thank you for submitting your question. The best time to trim arborvitae is through mid-summer. Below are helpful links on pruning trees and shrubs. Hope this helps!

https://extension.umn.edu/planting-and-growing-guides/pruning-trees-and-shrubs#evergreens-1336764

https://www.mortonarb.org/trees-plants/tree-and-plant-advice/horticulture-care/pruning-evergreens#:~:text=Arborvitae%20will%20withstand%20heavy%20pruning,new%20growth%20conceals%20pruning%20cuts.