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

Silene coronaria

Solidago hybrids

Spigelia marilandica

Symphyotrichum

Tanacetum

parthenium

Vernonia

noveboracensis

Veronica spicata

Veronicastrum

virginicum

31. erennials that do not respond well to P
    pinching

Acanthus spinosus

Alchemilla mollis

Aquilegia hybrids

Armeria maritima

Aruncus dioicus

Astilbe ×arendsii

Crocosmia

Delphinium

Dianthus

Dictamnus albus

Digitalis

Filipendula rubra

‘Venusta’

Filipendula ulmaria

Gaillardia

×grandiflora

Geranium

Geum hybrids

Hemerocallis

Heuchera

Hosta

Iris

Kniphofia hybrids

Ligularia dentata

Limonium

platyphyllum

Lupinus hybrids

Papaver orientale

Polygonatum

odoratum

‘Variegatum’

Primula

Rodgersia

Telekia speciosa

Verbascum

Sedum ‘Matrona’

Dianthus