Arborvitae

Question

Could you please recommend a root stimulator to ease transplant shock?

Answer 1

You can try Organic Root Stimulator, but these products are not always necessary. For newly planted trees/shrubs, I would simply water more deeply for at least 2-5 minutes to penetrate the soil.

These articles will also help:
https://www.gardeningknowhow.com/ornamental/trees/tgen/watering-newly-planted-tree.htm
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm