California Juniper
Juniperus californica
Cupressaceae · coniferous shrub · introduced
Last updated
Plant Profile
Size & Form
Height
25 ft
Spread
10-40 ft
Growth Rate
Slow
Site Requirements
Light
Full Sun
Soil Drainage
Moist
Soil pH
neutral to alkaline
Water
Moderate
Drought Tolerance
Medium
Hardiness
Zones 8a–8b
Ornamental Interest
Bloom Time
february to april
Origin
California, southern Nevada and western Arizona and into
Watch for this season
RustHigh
Uredinial Stage (Summer)
AphidHigh
Peak Population & Dispersal
Spring Population Buildup
Armillaria Root RotModerate
Active Below-ground Growth
+ 3 more — see full disease and pest lists below
Diseases: Regionally Documented (12)
Multiple genera (Melampsoridium, Thekopsora, Naohidemyces... Rust Phytophthora spp. (P Phytophthora Root Rot Phomopsis Twig Blight Magnesium Deficiency Canker and Dieback Pear Trellis Rust Armillaria spp. — primarily A Armillaria Root Rot Phoradendron villosum Mistletoe (a True Mistletoe) Taphrina wiesneri Witches' Broom Symptom category — not a single disease Leaf Blight Phytophthora lateralis Port Orford cedar root rot Seiridium cardinale Seiridium Canker
Pests: Regionally Documented (10)
Carulaspis juniperi Juniper scale Oligonychus ununguis Spruce spider mite Various (Agromyzidae, Gracillariidae, Tenthredinidae) Leafminer Juniper fall-webworm Oligotrophus betheli Juniper tip midge Argyresthia cupressella Cypress tip moth Aphidoidea Aphid Otiorhynchus spp. Root weevil Tetranychidae Spider mite Argyresthia spp. Cypress tip moth and allies
Data Maturity Structured Multiple sources. Expert review underway.