Map the Spread!


Visit CalWeedMapper for maps, suitable range models, and reports on invasive plants!

CalWeedMapper enables natural resource managers, scientists and others to: create maps and reports of invasive plant distribution, identify management opportunities, and update species distribution data.

Current Projects

1. Strategic Planning

Cal-IPC is working with multi-county regions to review data and set strategic management priorities for invasive plants using information on CalWeedMapper. Components include: 1) regional lists of strategic surveillance and eradication priority species, 2) education and outreach information for these species, 3) the ability to track new occurrence reports of these species in your region, 4) collaborative funding opportunities through grant-ready projects detailed in a workplan for these strategic species. More information…

2. Aggregate Data

We encourage users to submit single weed observations or entire GIS datasets to Calflora ( In return, land managers are able to view, share, download, and analyze very detailed spatial weed data. Distribution mapping and modeling are powerful tools to identify areas that are most vulnerable to new invasions. This information helps land managers prioritize detection and containment activities and win funding.

There are three easy ways to submit data:

Recent Projects (2010-2012)

1. Map Current Distribution

Cal-IPC compiled weed distribution data for all species on the Cal-IPC Inventory by USGS (7.5′) quadrangle and also compiled GIS datasets of population locations. We met with botanists, land managers, and local experts to map their knowledge about invasive plant distribution in their area. More information…

2. Model Future Suitable Range

Based on mapped distribution, GIS data (points, lines, polygons), and environmental layers we created predictive models showing mid-21st century suitable range for invasive plants in California with and without climate change. More information...

For more information, contact