Is your tree planted too deep? Why Planting a Tree Too Deep Is Harmful Trees need oxygen just as much as they need water. The upper root system naturally grows close to the soil surface, where oxygen is most available. When you bury the root flare, you create conditions that can lead to long-term decline. Trees planted too deeply may experience: Poor growth and reduced vigor Yellowing or thinning leaves Premature fall color or leaf drop Increased susceptibility to insects and diseases Trunk decay caused by constant soil and moisture [...]