| Latin Name | Common Name | Habit | Height | Hardiness | Growth | Soil | Shade | Moisture | Edible | Medicinal | Other |
| Lonicera involucrata | Twinberry, Twinberry honeysuckle | Shrub | 1.2 |
4-8
| M | LMH | N | M | 2 | 2 | 2 |
| x Sorbaronia hybrid | Aronia x mountain ash | Tree | 3.0 |
3-8
| M | LMH | N | M | 3 | 0 | 2 |
| x Sorbocrataegus hybrid | Haw x mountain ash | Tree | 3.0 |
3-8
| M | LMH | N | M | 5 | 0 | 2 |
| x Sorbopyrus hybrid | Pear x mountain ash | Tree | 4.0 |
3-8
| M | LMH | N | M | 4 | 0 | 2 |
| Xanthium commune | Canada cocklebur | Annual | 1.5 |
0-0
| | LMH | N | M | 1 | 0 | |
| Xanthium spinosum | Spiny Cocklebur | Annual | 0.5 |
6-9
| | LMH | N | M | 0 | 1 | 0 |
| Xanthium strumarium | Cocklebur, Rough cocklebur, Canada cocklebur | Annual | 0.8 |
6-9
| | LMH | N | DM | 1 | 3 | 2 |
| Xanthoceras sorbifolium | Yellowhorn | Shrub | 6.0 |
4-7
| S | LMH | N | DM | 3 | 0 | |
| Xanthorhiza simplicissima | Yellowroot | Shrub | 1.0 |
5-9
| F | LMH | FSN | MWe | 0 | 2 | 3 |
| Xanthorrhoea australis | Grasstree | Perennial | 1.0 |
-
| | LM | N | M | 2 | 1 | 2 |
| Xanthostemon verdugonianus | Mangkono | Tree | 30.0 |
10-12
| S | LMH | N | M | 0 | 0 | 4 |
| Xanthostemon verus | Iron Wood | Tree | 10.0 |
10-12
| M | LMH | N | M | 0 | 0 | 4 |
| Xerophyllum tenax | Indian Basket Grass, Common beargrass | Perennial | 1.2 |
4-8
| S | LM | SN | M | 1 | 1 | 2 |
| Xylosma japonica | | Tree | 25.0 |
7-10
| | LMH | SN | DM | 1 | 1 | 2 |
| Xyris caroliniana | Carolina Yelloweyed Grass | Perennial | 1.0 |
-
| | LMH | SN | MWe | 0 | 1 | |