Native plants for a wet and shaded garden in Georgia

Atlanta is wet by North American standards: NOAA's 1991–2020 normals for Hartsfield-Jackson put annual precipitation near 49 inches, about 1,250 mm, with a mean annual temperature around 63°F.

The pattern of that rain is changing. A 2018 analysis in the International Journal of Climatology found that intense precipitation events at the 99th percentile increased in both frequency and magnitude across the southeastern United States between 1950 and 2016, with the strongest increases inland from the Atlantic Coastal Plain. The Fifth National Climate Assessment's Southeast chapter documents the same rising extreme-rainfall and flooding risk.

Winters are shifting too. The USDA's updated Plant Hardiness Zone Map, published on 15 November 2023 and built from 1991–2020 extreme minimum winter temperatures at 13,412 stations, moved most of the Southeast half a zone warmer; Atlanta now reads 8a to 8b rather than 7b to 8a. The map measures the average coldest night of the year, not general warming, and a single severe cold snap — as in December 2022 — can still occur.

In practice, shaded low points in Atlanta gardens now stay saturated for longer between heavier storms. Southeastern natives adapted to woodland edge and floodplain conditions handle that cycle far better than imported ornamentals: sweetbay magnolia, silky dogwood, buttonbush and tag alder all appear in the Georgia Native Plant Society's Piedmont guide with wet and shade tolerance noted.

Raise planting slightly above the wettest ground, improve structure with organic matter rather than sand, and choose species that tolerate both saturation and the short dry spells between storms. The State Botanical Garden of Georgia and the Georgia Native Plant Society jointly publish the propagation and provenance guidance worth following for sourcing.