The plants in this list have an open, loose form. They are best displayed when mixed and interplanted with other perennials in a border.
| Common Name | Botanical Name |
| Columbine | Aquilegia |
| Coneflower | Echinacea |
| Globe thistle | Echinops |
| Sunflower | Helianthus |
| Rose campion | Lychnis coronaria |
| Poppy | Papaver |
| Pincushion flower | Scabiosa |
| Meadowrue | Thalictrum |
| Spiderwort | Tradescantia |