What are common reasons newly planted trees and shrubs fail to thrive?

Newly planted trees and shrubs often struggle due to incorrect planting depth or improper watering. Planting too deep can suffocate roots, while planting too shallow exposes them to air and temperature extremes. Overwatering can lead to root rot, and underwatering causes dehydration. Ensuring the root collar is level with the soil surface and establishing a consistent, deep watering schedule is crucial for successful establishment and robust growth.