Question

A homeowner planted a shade tree two years ago in a landscape with heavy clay soils. The tree has never thrived and is now showing dieback mostly in the lower canopy. They asked the advice of their neighbor, a Colorado Master Gardener, who noticed that the tree had been planted about 6 inches too deep and the homeowner has been overwatering trying to bring the tree back.

What is causing the dieback and what plant process is being interrupted?

Answer 1

Dieback in the tree's lower canopy is due to poor root health caused by being planted too deep and overwatering. This has led to the interruption of nutrient and water absorption, affecting the plant's photosynthesis and survival.

Step-by-step explanation:

The dieback observed in the lower canopy of the tree is most likely caused by the disruption of the tree's root system, which has been exacerbated by being planted too deeply in heavy clay soils and overwatering.

These conditions can lead to poor oxygen availability and the development of anaerobic soil conditions.

Furthermore, the roots may be suffocating or rotting, which interrupts the plant's process of nutrient uptake and water absorption.

This can further lead to reduced photosynthesis in the leaves due to inefficient nutrient supply and compromised plant structure.

Plants in dry areas often have deep root systems which provide better anchorage and access to moisture.

However, this tree's shallow rooting, compounded by the poor environmental conditions, has left it vulnerable and unable to acclimate or recover effectively, leading to the observed symptoms of decline.

Please mention the correct option in the final answer: The dieback is being caused by poor root health and the interruption of nutrient and water absorption, contributing to reduced photosynthesis and overall plant decline.