Coast Redwood Utility Pruning: Fog Water Myth and Directional Pruning

A homeowner challenged PG&E's "shaving" of 100-foot redwoods (limbs removed to trunk on one side) in March, questioning the forester's claim that redwoods pull water from fog.

Water Uptake Reality

Trees absorb water primarily through roots. Foliage may intercept minimal fog moisture—only enough to wet outer leaf cells. The forester's claim is incorrect.

Pruning Assessment

• Directional pruning (one-sided clearance) is standard for utility lines.
• Cutting limbs to trunk (not leaving stubs) prevents decay entry—this is correct.
• Redwoods tolerate this if >50% of crown remains and leader is intact.
• Timing: March is acceptable (after hardwood leaf-out); winter dormancy is ideal.

Outcome

Trees will survive but look asymmetrical. No increased mortality risk from this pruning alone.

Reference

Redwoods and Water Source