Tier 5 - Watch
| Amorpha fruticosa | False indigo bush |
| Buddleja davidii | Orange-eye butterfly-bush |
| Caragana arborescens | Siberian peashrub |
| Carassius auratus | Goldfish |
| Corydalis solida | Spring fumewort |
| Digitalis grandiflora | Yellow foxglove |
| Digitalis purpurea | Purple foxglove |
| Euonymus europaeus | European spindle-tree (spindle-tree) |
| Euphorbia lathyris | Mole plant, Caper spurge |
| Houttuynia cordata | Chameleon plant |
| Hyacinthoides hispanica | Spanish bluebells |
| Ilex crenata | Japanese holly |
| Kolkwitzia amabilis | Beautybush |
| Lamium galeobdolon | Yellow archangel |
| Leucojum aestivum | Summer snowflake |
| Lonicera tatarica | Tatarian honeysuckle |
| Lysimachia clethroides | Gooseneck yellow-loosestrife |
| Lysimachia punctata | Spotted loosestrife, Large yellow-loosestrife |
| Lythrum virgatum | European wand loosestrife |
| Macleaya cordata | Plume poppy |
| Mahonia bealei | Beales barberry |
| Ornithogalum umbellatum | Common star-of-Bethlehem |
| Petasites hybidus | Butterbur |
| Petasites japonicus | Fuki, Butterbur |
| Populus alba | White poplar |
| Quercus acutissima | Sawtooth oak |
| Spiraea japonica | Japanese spiraea, Japanese meadowsweet |
| Viburnum lantana | Wayfaring tree |
| Viburnum opulus | European cranberry bush, Guelder rose |
| Vinca minor | Common periwinkle, Lesser periwinkle |
