| Latin Name | Common Name | Habit | Height | Hardiness | Growth | Soil | Shade | Moisture | Edible | Medicinal | Other |
| Agrostis perennans | Upland Bent, Upland bentgrass | Perennial | 0.9 |
0-0
| | LMH | SN | DM | 1 | 0 | 2 |
| Aletris farinosa | Unicorn Root - Colic Root, White colicroot | Perennial | 0.6 |
6-9
| | LM | N | M | 1 | 3 | |
| Amelanchier utahensis | Utah Serviceberry, Coville's serviceberry | Shrub | 5.0 |
3-7
| | LMH | SN | DM | 3 | 1 | 2 |
| Aralia cordata | Udo | Perennial | 1.8 |
4-9
| | LMH | FS | M | 4 | 2 | 0 |
| Astronium urundeuva | Urunday | Tree | 10.0 |
10-12
| M | LMH | N | DM | 0 | 4 | 3 |
| 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 |
| Cynometra alexandri | Uganda ironwood, Muhimbi | Tree | 30.0 |
10-12
| M | MH | N | M | 0 | 0 | 4 |
| Darmera peltata | Umbrella Plant, Indian rhubarb, Indian Rubarb, Indian Rubarb | Perennial | 1.2 |
5-8
| M | LMH | SN | WeWa | 2 | 0 | 3 |
| Diphylleia cymosa | Umbrella Leaf, American umbrellaleaf | Perennial | 0.7 |
6-9
| | LM | S | M | 0 | 2 | |
| Diphylleia sinensis | Umbrella Leaf | Perennial | 0.4 |
-
| | LM | S | M | 0 | 2 | |
| 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 |
| Eleutherococcus sieboldianus | Ukogi, Five Leafed Aralia | Shrub | 3.0 |
4-8
| S | LMH | SN | M | 3 | 0 | 2 |
| Eucalyptus urnigera | Urn tree | Tree | 15.0 |
7-9
| F | LMH | SN | M | 0 | 3 | 3 |
| Eucryphia cordifolia | Ulmo | Tree | 20.0 |
8-11
| M | LMH | SN | M | 0 | 0 | 2 |
| Gossypium hirsutum | Upland Cotton | Shrub | 2.0 |
5-10
| F | LMH | N | M | 2 | 1 | 4 |
| Gynerium sagittatum | Uva Grass | Perennial | 4.0 |
10-12
| F | LMH | N | MWeWa | 0 | 2 | 3 |
| Laportea canadensis | Canadian Wood Nettle | Perennial | 1.0 |
0-0
| | LMH | SN | M | 3 | 1 | 2 |
| Lonicera utahensis | Utah Honeysuckle | Shrub | 1.5 |
4-8
| | LMH | N | M | 1 | 1 | |
| Manicaria saccifera | Ubussu, Troolie Palm | Tree | 10.0 |
11-12
| M | LMH | SN | MWe | 2 | 2 | 4 |
| 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 |
| Poraqueiba sericea | Umari | Tree | 20.0 |
10-12
| F | LMH | SN | DM | 4 | 0 | 2 |
| Proboscidea louisianica | Unicorn Plant, Ram's horn | Annual | 1.0 |
9-11
| | LMH | N | M | 2 | 0 | 2 |
| Rubus invisus | Upland dewberry | Shrub | 0.0 |
0-0
| | LMH | SN | M | 2 | 0 | 1 |
| Rubus pergratus | upland blackberry | Shrub | 3.0 |
-
| | LMH | SN | M | 2 | 0 | 1 |
| Salix commutata | undergreen willow | Shrub | 3.0 |
4-8
| | LMH | SN | MWe | 1 | 2 | 3 |
| Sarcocornia utahensis | Utah Pickleweed,Utah Swampfire | Perennial | 0.2 |
0-0
| | LMH | SN | M | 1 | 0 | |
| Sciadopitys verticillata | Umbrella Pine, Japanese Umbrella Pine | Tree | 15.0 |
5-7
| M | LMH | SN | MWe | 0 | 0 | 3 |
| Semiarundinaria murielae | Umbrella Bamboo | Bamboo | 4.0 |
6-9
| S | LMH | SN | M | 0 | 0 | 3 |
| Thamnocalamus spathaceus | Umbrella Bamboo | Bamboo | 4.0 |
5-9
| | LMH | FSN | M | 0 | 0 | 2 |
| Torilis japonica | Upright Hedge Parsley, Erect hedgeparsley | Annual | 1.0 |
0-0
| | LMH | SN | DM | 2 | 1 | |
| 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 |
| Ulmus americana | American Elm, Gray Elm, Water Elm | Tree | 25.0 |
3-9
| M | LMH | SN | M | 2 | 2 | 3 |
| 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 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 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 |
| Umbilicus rupestris | Pennywort | Perennial | 0.3 |
6-9
| | LM | SN | M | 3 | 1 | |
| 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 |
| Urtica californica | Stinging Nettle, California nettle | Perennial | 1.8 |
3-10
| | LMH | SN | M | 2 | 2 | 4 |
| 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 lyallii | Stinging Nettle | Perennial | 1.2 |
-
| | LMH | SN | M | 3 | 3 | 3 |
| Urtica procera | Stinging Nettle, California nettle | Perennial | 1.5 |
0-0
| | LMH | SN | M | 3 | 2 | 3 |
| Vaccinium simulatum | upland highbush blueberry | Shrub | 1.0 |
-
| | LM | SN | M | 2 | 0 | |
| Vachellia tortilis | Umbrella Thorn | Tree | 15.0 |
10-12
| F | LM | N | DM | 2 | 2 | 4 |
| Veronica undulata | Undulate speedwell | Perennial | 1.0 |
0-0
| | LMH | N | MWe | 1 | 1 | |