Redwood Trees on a Bay Area Hillside: Risk Assessment

Redwood Trees on a Bay Area Hillside: Risk Assessment

Planting coast redwoods (Sequoia sempervirens) on a slope above a house in the SF Bay Area.

Risks

• Shallow, wide root systems—poor anchorage on steep slopes.
• Mature height 200+ ft; failure catastrophic.
• Natural stands fail regularly in winter storms.
• Fog drip increases soil saturation, reducing stability.

Better Alternatives

• Native oaks (Quercus agrifolia) – deep roots, slope-adapted.
• California bay (Umbellularia) – evergreen, strong wood.
• Toyon (Heteromeles) – small tree, berries, fire-resistant.
• Manzanita (Arctostaphylos) – sculptural, drought-tough.

Consult a Pro

Hire a certified arborist or geotechnical engineer for site-specific assessment. Do not guess with redwoods near a home.