Science · High-Value Shrubs
Camellia
Evergreen flowering shrubs; sasanqua types commonly flower in fall, while japonica cultivars commonly flower in winter to spring.
Profile
- Hardiness
- Species- and cultivar-dependent; verify local adaptation
- Size
- Japonica and sasanqua cultivars differ markedly; check cultivar mature size
- Soil
- Acidic, organic-rich and well drained; use a soil test
- Light
- Partial shade; sun tolerance varies by type
Source: Camellia — Clemson Extension HGIC ↗ — Distinguishes C. japonica and C. sasanqua sizes and flowering seasons; covers cultivation and problems.
No cited publication establishes a species-wide numeric VWC target. Calibrate sensor thresholds to soil/substrate, rooting depth and field observations; symptoms are not diagnoses. Salt spray tolerance does not establish an irrigation-water or root-zone salinity threshold. Two species and many cultivars are grouped here; remove unqualified zone, height and pH ranges rather than imply universal limits.
Water & soil context
- Moisture (VWC)
- Site-calibrated; no universal numeric VWC target established
- Salinity tolerance
- No quantitative root-zone or irrigation-water tolerance established by these sources; test soil and water.
- Drought tolerance
- Depends on species, cultivar and establishment.
Maintain moisture without saturation, especially during establishment and bud development. Bud drop has several possible causes; uneven moisture is not the only explanation.
Problems to watch
- Camellia petal blight
- Tea scale
- Root rot
Stress signs
- Bud drop: check moisture, weather and other causes
- Yellowing or decline: inspect roots and test soil
Where you'll find it
- Estate gardens
- Campuses
Sources & scope
- Camellia — Clemson Extension HGIC ↗
Distinguishes C. japonica and C. sasanqua sizes and flowering seasons; covers cultivation and problems.
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All Science profilesPublished botanical and soil references are distinct from GroundWorx product guidance. Moisture thresholds and monitoring depths require site calibration; sources do not establish product performance or diagnose stress.