MEET THE SPECIALIST
Joseph DiBernardo —"The Tree Doctor"
For over half a century, Joseph DiBernardo has devoted his career to a single purpose: preserving trees, not removing them. Known throughout the region simply as "The Tree Doctor," Joseph brings unmatched expertise in diagnosing and treating the diseases and stressors that threaten mature trees.
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Four Seasons Tree Specialists was founded on the conviction that every tree can be saved with the right diagnosis. Unlike general landscapers, we focus exclusively on tree health — using advanced diagnostics, soil analysis, and organic treatment protocols to address the root cause of decline.
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Our clientele includes estate homeowners, commercial property managers, and HOA communities across Ventura County and surrounding areas who demand the highest standard of care for their most valuable landscape assets.
Specialized Tree Health Services
Every treatment is tailored to your property's unique needs — because exceptional trees deserve exceptional care.​
OUR EXPERTISE
⦿ Tree Spraying
Targeted foliar applications that protect your trees from invasive pests and disease before damage takes hold.
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⦿ Trunk Injections
Precision micro-injections deliver nutrients and treatments directly into the vascular system for fast, focused results.
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⦿ Deep Fertilizing
Subsurface root-zone fertilization that strengthens root systems and fuels long-term vigor and resilience.
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⦿ Systemic & Organic Treatments
Environmentally responsible, science-backed protocols that restore tree health while protecting your landscape's ecosystem.
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⦿ Lawn Treatments
Comprehensive care programs for lush, naturally nourished lawns that complement your trees and estate.
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⦿ Soil Analysis
Laboratory-grade soil diagnostics paired with custom amendment plans for healthier trees and a thriving yard.
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And More!!!
Service Area
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Serving Ventura & LA County & Surrounding Areas
We provide elite tree care services throughout the greater Ventura County, bringing certified expertise to the most distinguished properties in Southern California.
Westlake Village
Thousand Oaks
Agoura Hills
Calabasas
Oak Park
Malibu
Hidden Hills
Woodland Hills
CONTACT US FOR A QUOTE
P.O. Box 4592 Westlake Village, CA 91359
(818) 991-2811 / (310) 285-3261