Grasses are essential for lightening the herbaceous border. Their airy panicles relieve the gaudy blooms of later summer and the gentle movement of their stems introduces a dynamic element into too rigid plantings. I am no great lover of short grasses. Plant tall grasses such as Calamagrostis, Sorghastrum, Deschampsia, Molinia, Stipa gigantea, and Miscanthus with tall Perennials such as Achilleas, Aster horizontalis, Campanula lactiflora, Eupatoriums, Filipendula, Foeniculeum vulgare Purpureum, Heleniums, Hemerocallis, Lythrums, Monardas, Sanguisorba, Sedums and Thalictrums.