| Common Name | Latin Name |
|---|---|
| Gamagrass | see Eastern Gamagrass |
| Garden Vetch | see Common Vetch |
| Garlic Mustard | Allaria petiolata |
| German Moss | see Knawel |
| Giant Foxtail | Setaria faberi |
| Giant Ragweed | Ambrosia trifida |
| Giant Whiteweed | see Perennial Pepperweed |
| Globe Flatsedge | Cyperus echinatus |
| Goat's-beard | Tragopogon dubius |
| Goosegrass | Eleusine indica |
| Gopher Plant | see Caper Spurge |
| Grass pink | see Deptford Pink |
| Great Reedmace | see Cattails |
| Green Foxtail | Setaria viridis |
| Green Kyllinga | Kyllinga brevifolia |
| Green Milkweed | Asclepias viridis |
| Green Pigweed | see Slender Amaranth |
| Greenbrier | Smilax bona-nox |
| Ground Burnut | see Puncturevine |
| Ground Honeysuckle | see Birdsfoot Trefoil |
| Ground Ivy | Glechoma hederacea |
| Gum Weed | see Compass Plant |
