| Latin Name | Common Name | Habit | Height | Hardiness | Growth | Soil | Shade | Moisture | Edible | Medicinal | Other |
| Chasmanthium latifolium | Indian Woodoats, Wild Oats Grass, North American Wild Oats, Northern Sea Oats, Spanglegrass River Oa | Perennial | 1.0 |
4-10
| M | LM | SN | M | 1 | 0 | 3 |
| Disporum sessile | Japanese Fairy Bells | Perennial | 0.6 |
4-8
| F | LMH | S | M | 1 | 0 | |
| Disporum viridescens | | Perennial | 0.6 |
-
| | LMH | FS | M | 1 | 0 | |
| Distichlis palmeri | Nipa. Palmer saltgrass, NyPa Wild Wheat | Perennial | 0.4 |
10-12
| F | LMH | SN | MWeWa | 4 | 0 | 2 |
| Laportea canadensis | Canadian Wood Nettle | Perennial | 1.0 |
0-0
| | LMH | SN | M | 3 | 1 | 2 |
| Oreocnide integrifolia | Wild Rhea | Tree | 12.0 |
10-12
| S | LMH | FS | MWe | 0 | 0 | 4 |
| Oxandra laurifolia | Yaya, lancewood | Tree | 10.0 |
10-12
| M | LMH | N | M | 0 | 0 | 4 |
| Panicum maximum | Guinea grass. Green panic grass | Perennial | 2.0 |
10-12
| F | LM | FSN | DM | 1 | 2 | 2 |
| Uapaca kirkiana | Wild Loquat | Tree | 12.0 |
10-12
| M | LM | SN | M | 4 | 2 | 3 |
| Ugni molinae | Uñi, Chilean guava | Shrub | 2.0 |
7-11
| M | LMH | N | DM | 5 | 0 | 3 |
| Ulex europaeus | Gorse, Common gorse | Shrub | 1.5 |
5-9
| F | LMH | N | DM | 1 | 1 | 5 |
| Ulex parviflorus | | Shrub | 1.5 |
6-9
| F | LMH | N | DM | 0 | 0 | 3 |
| Ullucus tuberosus | Olluco | Perennial | 0.3 |
8-10
| | LM | N | M | 3 | 0 | 0 |
| Ulmus alata | Winged Elm | Tree | 15.0 |
6-9
| F | LMH | SN | M | 2 | 0 | 2 |
| Ulmus americana | American Elm, Gray Elm, Water Elm | Tree | 25.0 |
3-9
| M | LMH | SN | M | 2 | 2 | 3 |
| Ulmus davidiana | Japanese Elm | Tree | 15.0 |
4-8
| | LMH | SN | M | 2 | 0 | 1 |
| Ulmus glabra | Wych Elm, Table-top Scotch Elm, Scotch Elm | Tree | 30.0 |
5-7
| F | LMH | SN | M | 3 | 2 | 2 |
| Ulmus japonica | Japanese Elm | Tree | 35.0 |
4-8
| | LMH | SN | M | 2 | 1 | 1 |
| Ulmus laciniata | | Tree | 10.0 |
4-8
| | LMH | SN | M | 2 | 0 | |
| Ulmus macrocarpa | | Tree | 10.0 |
4-8
| | LMH | SN | DM | 2 | 1 | 1 |
| Ulmus parvifolia | Chinese Elm, Lacebark Elm | Tree | 18.0 |
5-10
| M | LMH | SN | M | 2 | 1 | 2 |
| Ulmus procera | English Elm | Tree | 35.0 |
5-9
| F | LMH | SN | M | 3 | 2 | 3 |
| Ulmus pumila | Siberian Elm, Hybrid elm | Tree | 15.0 |
4-9
| F | LMH | SN | DM | 2 | 2 | 3 |
| Ulmus rubra | Slippery Elm | Tree | 20.0 |
3-7
| M | LMH | SN | M | 2 | 5 | 3 |
| Ulmus thomasii | Rock Elm | Tree | 30.0 |
-
| S | LMH | SN | M | 1 | 0 | 2 |
| Ulmus villosa | Cherry Bark Elm | Tree | 25.0 |
4-8
| | LMH | SN | M | 1 | 0 | 2 |
| Ulmus wallichiana | | Tree | 35.0 |
5-9
| | LMH | SN | M | 1 | 1 | 3 |
| Umbellularia californica | California Laurel, California Bay | Tree | 25.0 |
7-10
| M | LMH | N | M | 4 | 2 | 3 |
| Umbilicus rupestris | Pennywort | Perennial | 0.3 |
6-9
| | LM | SN | M | 3 | 1 | |
| Uncaria guianensis | Cat's Claw | Climber | 30.0 |
10-12
| F | LM | N | M | 2 | 4 | 2 |
| Uncaria rhynchophylla | | Climber | 0.0 |
-
| | LMH | SN | M | 0 | 2 | 1 |
| Uncaria tomentosa | Cat's Claw | Climber | 25.0 |
10-12
| F | LM | SN | M | 2 | 4 | 2 |
| Uniola paniculata | Sea Oats, Sea Oats Grass | Perennial | 2.5 |
7-11
| M | LM | SN | M | 2 | 0 | 2 |
| Urceola micrantha | | Climber | 50.0 |
-
| | LMH | SN | M | 0 | 2 | |
| Urera baccifera | Nettle Tree, Chichaste, Ortiga | Shrub | 4.0 |
10-12
| F | LMH | SN | MWe | 0 | 2 | 4 |
| Urginea maritima | Sea Squill, Red squill | Bulb | 1.0 |
8-11
| | LM | N | DM | 0 | 3 | 1 |
| Urochloa mosambicensis | Sabi grass, Gonya grass, Bushveld signal grass | Perennial | 1.2 |
10-12
| F | LMH | SN | M | 2 | 0 | 2 |
| Urospermum dalechampii | | Perennial | 0.5 |
5-9
| | LMH | SN | M | 1 | 0 | |
| Urtica angustifolia | | Perennial | 1.5 |
-
| | LMH | SN | M | 3 | 0 | 3 |
| Urtica breweri | Stinging nettle | Perennial | 1.0 |
0-0
| | LMH | SN | M | 3 | 2 | 3 |
| Urtica californica | Stinging Nettle, California nettle | Perennial | 1.8 |
3-10
| | LMH | SN | M | 2 | 2 | 4 |
| Urtica cannabina | | Perennial | 1.5 |
-
| M | LMH | SN | M | 3 | 0 | 3 |
| Urtica dioica | Stinging Nettle, California nettle | Perennial | 1.2 |
3-10
| F | LMH | SN | M | 5 | 5 | 4 |
| Urtica gracilis | Stinging Nettle | Perennial | 1.5 |
-
| | LMH | SN | M | 3 | 3 | 3 |
| Urtica holosericea | Stinging Nettle | Perennial | 2.5 |
-
| | LMH | SN | M | 3 | 2 | 2 |
| Urtica hyperborea | | Perennial | 0.3 |
-
| | LMH | N | M | 3 | 0 | 3 |
| Urtica incisa | Scrub Nettle | Perennial | 1.8 |
-
| | LMH | SN | M | 3 | 0 | 3 |
| Urtica laetevirens | | Perennial | 1.0 |
-
| | LMH | SN | M | 3 | 0 | 3 |
| Urtica lyallii | Stinging Nettle | Perennial | 1.2 |
-
| | LMH | SN | M | 3 | 3 | 3 |
| Urtica parviflora | | Perennial | 0.5 |
-
| | LMH | SN | M | 3 | 1 | 3 |
| Urtica pilulifera | Roman Nettle | Annual | 0.6 |
-
| | LMH | N | M | 3 | 3 | 3 |
| Urtica platyphylla | | Perennial | 1.8 |
-
| | LMH | SN | M | 3 | 0 | 3 |
| Urtica procera | Stinging Nettle, California nettle | Perennial | 1.5 |
0-0
| | LMH | SN | M | 3 | 2 | 3 |
| Urtica serra | California nettle | Perennial | 1.5 |
0-0
| | LMH | SN | M | 3 | 2 | 3 |
| Urtica thunbergiana | | Perennial | 0.8 |
-
| | LMH | SN | M | 3 | 0 | 3 |
| Urtica urens | Annual Nettle | Annual | 0.6 |
-
| | LMH | N | M | 3 | 3 | 3 |
| Utricularia vulgaris | Bladderwort | Perennial | 0.0 |
4-8
| | LMH | N | Wa | 1 | 1 | |
| Uvularia grandiflora | Fairybells, Merry Bells, Bellwort, Largeflower bellwort | Perennial | 0.3 |
4-9
| M | LM | FS | M | 0 | 3 | |
| Uvularia perfoliata | Bellwort, Perfoliate bellwort | Perennial | 0.4 |
4-8
| | LM | FS | M | 2 | 2 | |
| Uvularia sessilifolia | Bellwort, Sessileleaf bellwort | Perennial | 0.3 |
4-8
| F | LM | FS | M | 2 | 1 | |