Deep soil amendment to revitalize struggling trees
Radial trenching is a proven technique for improving soil conditions throughout a tree's root zone. By creating trenches radiating outward from the trunk and filling them with compost and amendments, we improve soil structure, drainage, and nutrient availability. This intensive treatment can revitalize trees suffering from poor soil conditions or compaction.
We create narrow trenches radiating from the trunk like spokes on a wheel, extending outward to the drip line or beyond. These trenches are excavated to a depth of 12-18 inches, then backfilled with a mixture of compost, soil amendments, and the native soil. The result is improved soil structure throughout the root zone.
The compost-amended trenches create pathways for root growth into better soil conditions. Over time, roots colonize these trenches, accessing improved nutrition and water. The organic matter also enhances microbial activity, improving overall soil health and function.
Before beginning work, our certified arborists assess the tree's condition and the site conditions. We locate utilities, determine the appropriate trench pattern, and select amendments based on soil test results when available. Proper planning ensures we maximize benefits while minimizing any root disturbance.
We typically use air spading equipment to create the trenches, which allows us to excavate soil while leaving roots intact. This selective excavation method is far superior to traditional mechanical trenching, which severs roots indiscriminately. When air spading isn't appropriate, we carefully hand-excavate to minimize root damage.
Trenches are typically 2-4 inches wide and extend from about 3 feet from the trunk to well beyond the drip line. We create 6-12 trenches depending on tree size, distributing them evenly around the tree.
We backfill trenches with high-quality compost mixed with beneficial amendments. The amendment blend typically includes:
This rich mixture creates an ideal environment for root growth and beneficial soil organisms.
After completing the trenching, we apply a layer of mulch to protect the disturbed soil and retain moisture. We provide detailed watering recommendations and may suggest follow-up treatments such as fertilization or pest management to support the tree's recovery and growth.
Radial trenching is best performed during the tree's dormant season or in early spring before active growth begins. This timing minimizes stress and allows the tree to take advantage of improved soil conditions as it enters the growing season. We can perform this service year-round when conditions allow, though we avoid frozen ground and extremely dry periods.
Radial trenching is often most effective when combined with other tree care services. We may recommend concurrent treatments such as crown pruning to reduce demand on the root system, pest or disease management to eliminate stress factors, or vertical mulching to address compaction in different areas of the root zone.
Contact us to discuss whether radial trenching is right for your trees and schedule a consultation with our certified arborists.
Call 631-467-7999