- erennials that may require division every P
4–5 years
Acanthus spinosus
Achillea ‘Coronation
Gold’
Anaphalis triplinervis
Armeria maritima
Artemisia lactiflora
Aster tataricus ‘Jindai’
Astrantia major
Bergenia crassifolia
Boltonia asteroides
‘Snowbank’
Campanula glomerata
Campanula rotundifo-
lia ‘Olympica’
Ceratostigma
plumbaginoides
Chelone lyonii
Chrysogonum
virginianum
Dianthus
gratianopolitanusDicentra formosa
‘Luxuriant’
Digitalis grandiflora
Eutrochium
Geranium phaeum
Helianthemum
nummularium
Helianthus salicifolius
Heliopsis
helianthoides
Hemerocallis
Heterotheca villosa
Iris Louisiana
hybrids
Kalimeris mongolica
Lamium maculatum
Liatris spicata
Oenothera fruticosa
Phlox stoloniferaPodophyllum
peltatum
Rudbeckia fulgida
‘Goldsturm’
Rudbeckia nitida
‘Herbstsonne’
Sanguisorba
Scabiosa columbaria
‘Butterfly Blue’
Silphium perfoliatum
Solidago hybrids
Stachys byzantina
Stokesia laevis
Thymus
Tiarella cordifolia
Tradescantia
×andersoniana
Veronica austriaca
subsp. teucrium
Veronicastrum
virginicumLamium maculatum