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Redwood Root Damage from Trenching: Assessment and Recovery

Can Redwoods Survive Major Root Cuts?

A homeowner installing a French drain five feet from a grove of 30-year-old redwoods accidentally severed two large roots (5–6 inches in diameter) on one tree. The trees stand about 75 feet tall with trunks 2.5 feet thick, growing in a damp, shady grove among even larger redwoods.

Expert Evaluation

Because the cuts were clean and the soil remains moist, the tree’s extensive root system can likely compensate for the loss. The key factors:

Clean cuts reduce disease entry.
Root loss percentage matters: cutting farther from the trunk removes a smaller proportion of the total root zone.
Soil moisture in the grove supports recovery.

Expected Outcome

The tree may shed some foliage on the side of the cut roots, but long-term health is usually unaffected. No treatment is needed beyond monitoring. The worst-case scenario is temporary canopy thinning, with full recovery over time.

Practical Advice

When trenching near mature trees, stay as far from the trunk as possible. If large roots are encountered, consider rerouting. Clean cuts and adequate soil moisture are the best allies for tree survival.

Conifers: Dealing with Tree Roots in the Lawn: Removal and Prevention; Saving a Castle Cactus from Root Rot; Conifer Root Cutting During Garden Work: Damage Assessment; Conifer Hedge Root Cutting for Driveway Repair; Conifer Roots in Lawn: Managing Surface Roots Without Harming Trees; Coast Redwood Root Stability and Hazard Assessment Near Structures; Removing an Olive Tree in California Without Herbicides; Globe Willow Roots Lifting Sidewalks: Cut or Cover?; Saving an Oak Tree After Surface Root Cutting; Mowing in Drought: Leave Grass Tall to Shade Soil

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