What does native to your county mean?

“Native to this county” is a claim about a species and a place. It does not identify the source of a nursery plant, predict whether it will thrive in your garden, or mean that every map uses the same definition.

Name the place and the claim

Start with the plant’s scientific name, the geographic unit, and what “native” means in the source. A county map may describe historical range; another reference may report current observations or a status at the state, provincial, or national level. Keep the source date and any taxonomic or coverage limits with the result.

The National Wildlife Federation’s U.S. Native Plants Finder describes historical ranges based on county-level USDA maps. It notes that a state-level label can be broader than a county result. Treat a nearby county result as a reason to check another source, not as proof that the plant is native at your own location.

Use each map for its question

An ecoregion groups places with similar ecological characteristics. It can help describe regional context, but it is not a species-range map. An occurrence database records observations or specimens; it can show that a plant was recorded somewhere without establishing historical nativity. USGS warns that BISON records are not comprehensive for species ranges or distributions, so a missing record does not establish absence.

Data fields also matter. NatureServe can show native and exotic indicators at national and subnational levels, and those indicators may coexist. A national status does not mean a species is native throughout the country.

When sources disagree

Compare the scientific name, geographic unit, status definition, evidence date, and completeness of each source. Do not average two different kinds of answers into one certainty. For Canadian locations, use a provincial, territorial, or regional flora that covers the place; a U.S. county tool is not a Canadian authority.

For a plant you are considering, write down the source and the narrowest place it supports. Keep the species-range question separate from where a particular lot came from and from whether it fits your site.