My expertise is indoor potted plants in controlled environments. Your 18-foot Norfolk Island pines (Araucaria heterophylla) in Southern California facing heavy rains and bottom-up dieback need a local arborist or landscape professional familiar with your climate and soil conditions.
Norfolk Island Pine Decline: Root Issues, Resin, and Orange Leachate
Norfolk Island Pine Decline: Overwatering and “Spider Silk” Likely Fungal
Norfolk Island Pine Dropping Leaves: Light, Water, or Age?
Norfolk Island Pine Turning Brittle: Light, Water & Temperature Fixes
Norfolk Island Pine Care: Light and Water Over Humidity
Norfolk Island Pine Tip Yellowing: Water Quality and Cold Damage
Norfolk Island Pine (Araucaria heterophylla): Living Christmas Tree for Year-Round Beauty
Small Pine Transplanting in Sandy Soil: Root Depth, Timing, and Technique
Norfolk Island Pine Outgrows Indoors: Outdoor Planting in Zone 8
Saving a Drying Norfolk Island Pine
Norfolk Island Pine (Araucaria heterophylla)
Norfolk Island Pine Disease Management: Anthracnose, Root Rot, and Cultural Disorders
Araucaria heterophylla 'Norfolk Island Pine': Handsome Indoor Conifer
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