01Available research
State Extension and land-grant sources
The canonical national registry keeps location sources with each model, while the first August bundle keeps horticultural sources attached to plant guidance and activity windows.
Source scope retained per record02Local help
State and county Extension
State or county guidance may be newer and more specific than a broad regional row, especially for cultivars, diagnoses, and local restrictions. New York and Vermont still require a county/local selection step before their fallback models can be used honestly.
County/local runtime step pending03Hardiness
USDA zones are not planting months
Hardiness zones describe average extreme winter cold for perennials; they do not encode local heat, rainfall, microclimates, or annual crop timing.
Location layers kept separate