The Well-Tended Perennial Garden The Essential Guide to Planting and Pruning Techniques, Third Edition

10. erennials that may require division every P
    1–3 years

Achillea millefolium

Achillea ‘Moonshine’

Ajuga reptans

Alcea rosea

Anchusa azurea

Artemisia ludoviciana

‘Silver King’

Aster ×frikartii

‘Mönch’

Astilbe ×arendsii

Campanula carpatica

Campanula

persicifolia

Centaurea montana

Centranthus ruber

Cephalaria gigantea

Cerastium

tomentosum

Chrysanthemum

×morifolium

Coreopsis grandiflora

Coreopsis tripteris

Coreopsis verticillata

Cota tinctoria

Crocosmia

Delphinium elatum

Dianthus barbatus

Dianthus deltoides

Digitalis purpurea

Doronicum

Fragaria ‘Pink Panda’

Gaillardia

×grandiflora

Geum hybrids

Helenium autumnale

Helianthus ‘Lemon

Queen’

Heuchera micrantha

‘Palace Purple’

Heuchera sanguinea

Hypericum calycinum

Inula

Iris domestica

Iris ×germanica

Leucanthemum

×superbum

Lobelia cardinalis

Lysimachia

Macleaya cordata

Malva alcea

‘Fastigiata’

Matteuccia

struthiopteris

Monarda didyma

Oenothera speciosa

Origanum laevigatum

‘Herrenhausen’

Penstemon barbatus

Persicaria amplexi-

caulis ‘Firetail’

Phlox maculata

Phlox paniculata

Phlox subulata

Physostegia virginiana

Potentilla

Primula

Sidalcea malviflora

Silene coronaria

Sisyrinchium

angustifolium

Symphyotrichum

Tanacetum

parthenium

Veronica spicata

Campanula 'Pink Octopus'