Prohibited Species: San Diego vs San Marcos
How do prohibited species rules compare between San Diego, CA and San Marcos, CA?
San Diego and San Marcos have similar restriction levels.
San Diego, CA
San Diego County
San Diego restricts invasive non-native species in landscaping near open spaces. The city's Landscape Standards reference a Prohibition Plants list. The California Invasive Plant Council (Cal-IPC) identifies high-priority invasive species. The SD County Invasive Ornamental Plant Guide lists problematic species for the region.
View full San Diego rules →San Marcos, CA
San Diego County
California's noxious weed list (Food & Ag Code §5004) applies in San Diego County. The San Diego County Agricultural Commissioner enforces state plant quarantines and monitors invasive pests. Arundo donax (giant reed), pampas grass, and ice plant are significant invasives in the region.
View full San Marcos rules →Key Facts Comparison
| Fact | San Diego | San Marcos |
|---|---|---|
| Open Space Rule | No invasive non-natives adjacent to open space | - |
| Key Invasives | Arundo donax, pampas grass, iceplant | - |
| Cal-IPC | Statewide invasive plant classifications | - |
| Landscape Code | SDMC §142.0403 | - |
| Authority | - | SD County Ag Commissioner |
| Key Invasive | - | Giant reed (Arundo) |
| State Law | - | CA Food & Ag Code §5004 |
| Water Ordinance | - | MWELO compliance |
Highlighted rows indicate differences between cities.
San Diego FAQ
What plants are prohibited in San Diego?
Invasive non-native species are prohibited adjacent to open space areas. The city's Prohibition Plants list and Cal-IPC High list include giant reed, pampas grass, iceplant, and fountain grass. New development must use water-efficient, non-invasive landscaping.
Where can I find a list of invasive plants for San Diego?
The San Diego County Invasive Ornamental Plant Guide (ASLA-SD/CNPS) and the California Invasive Plant Council (cal-ipc.org) provide comprehensive lists. The city's Prohibition Plants list is available through Development Services.
San Marcos FAQ
What invasive plants are a problem in San Diego County?
Giant reed (Arundo donax), pampas grass, ice plant, and tamarisk are significant invasives. The county runs active removal programs for Arundo along waterways.
Does San Diego County regulate landscaping plants?
New landscaping over 500 sq ft must comply with the state MWELO, which limits high-water-use species. State-listed noxious weeds are prohibited under the Food and Agriculture Code.
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