Modules:

Design or redesign a landscape

Estimate the water needs of landscape plants

Determining a factor for landscape plants other than turfgrass, part 2: Observation-based approach

Assigning a species factor, KS

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Table 4. Observation-based species factor (KS) for selected palms in Southern California*

  Factor (KS) for South Coast Factor (KS) for South Inland
Name of Plant Source 1** Source 2*** Source 1** Source 2***
Brahea armata (blue hesper palm) 0.25 0.10–0.30 0.25 0.10–0.30
Brahea edulis (Guadalupe palm) 0.25 0.10–0.30 0.25–0.50 0.10–0.30
Butia capitata (pindo palm) 0.25 0.10–0.30 0.25 0.10–0.30
Chamaerops humilis (Mediterranean fan palm) 0.25 0.40–0.60 0.25 0.40–0.60
Phoenix canariensis (Canary Island date palm) 0.25 0.10–0.30 0.25–0.50 0.10–0.30
Phoenix dactylifera (date palm) 0.25 0.10–0.30 0.25 0.10–0.30
Trachycarpus fortunei (windmill palm) 0.25 0.40–0.60 0.25–0.50 0.40–0.60
Washingtonia filifera (California fan palm) 0.25 0.10–0.30 0.25–0.50 0.10–0.30
Washingtonia robusta (Mexican fan palm) 0.25 0.10–0.30 0.25–0.50 0.10–0.30

* Observation-based estimated percentages of the reference evapotranspiration, expressed as fractions

** Adapted from Perry 1992

*** Adapted from Costello and Jones 1999

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