Less amorphous, somewhat taller filler plants that tend to become more amorphous after flowering: Centranthus ruber Knautia macedonica Euphorbia dulcis 'Chameleon'
Intermediate plants, many of them becoming strongly structural after flowering: Eryngium giganteum Thalictrum aquilegiifolium Phlomis russeliana Salvia nemorosa Sedum telephium