One of the best ways to keep color in your perennial border a little longer is to deadhead spent flowers. Reasons for deadheading generally falls into three categories: to encourage reflowering of some perennials; to limit seed production and/or self-seeding of other perennials; and to improve the overall appearance of the plant.
Some of the common perennials that may rebloom after deadheading include (Disabato-Aust):
- Allwood pinks (Dianthus X allwoodii cvs.)
- Baby’s breaths (Gypsophila paniculata and cvs.)
- Bee balms (Monarda didyma and cvs.)
- Blanket flowers (Gaillardia X grandiflora cvs.)
- Butterfly weed (Asclepias tuberosa)
- Checker mallows (Sidalcea malviflora and cvs.)
- Cheddar pinks (Dianthus gratianopoIitanus and cvs.)
- Columbines (Aquilegia spp. and cvs.)
- Culver’s root (Veronicastrum virginicum)
- Dame’s rockets (Hesperis matronalis and cvs.)
- Delphiniums (Delphinium spp. and cvs.)
- False sunflowers (Heliopsis helianthoides and cvs.)
- Foxgloves (Digitalis spp. and cvs.)
- Garden phloxes (Phlox paniculata cvs.)
- Gauras (Gaura lindheimeri and cvs.)
- Geums (Geum spp. and cvs.)
- Globe thistles (Echinops ritro and cvs.)
- Golden marguerites (Anthemis tinctoria and cvs.)
- Hardy begonia (Begonia grandis ssp. evansiana)
- Hollyhocks (Alcea rosea cvs.)
- Italian bugloss (Anchusa azurea)
- Jupiter’s beard (Centranthus ruber)
- Lavenders (Lavandula spp. and cvs.)
- Lilyleaf ladybell (Adenophora liliifolia)
- Lupines (Lupinus spp. and cvs.)
- Masterworts (Astrantia major and cvs.)
- Meadow phloxes (Phlox maculata and cvs.)
- Monkshoods (Aconitum spp. and cvs.)
- Mountain bluet (Centaurea montana)
- Painted daisies (Tanacetum coccineum and cvs.)
- Patrinia (Patrinia scabiosifolia)
- Penstemons (Penstemon barbatus and cvs.)
- Perennial salvia* (Salvia nemorosa and cvs.)
- Pincushion flowers (Scabiosa spp. and cvs.)
- Purple coneflower (Echinacea purpurea)
- Purple toadflaxes (Linaria purpurea and cvs.)
- Queens-of-the-meadow (Filipendula ulmaria and cvs.)
- Rose campions (Lychnis coronaria and cvs.)
- Shasta daisies (Leucanthemum X superbum cvs.)
- Sneezeweed (Helenium autumnale)
- Spike speedwells (Veronica spicata cvs.)
- Spiderworts (Tradescantia X andersoniana cvs.)
- Stokes’ asters (Stokesia laevis and cvs.)
- Sweet violets (Viola odorata and cvs.)
- Tickseeds (Coreopsis spp. and cvs.)
- Upright hollyhock mallow (Malva alcea var. fastigiata)
- Yarrows (Achillea spp. and cvs.)
- Yellow corydalis (Corydalis lutea)
Not all perennials will rebloom after deading, but they sure will make the garden look much better. Some of these perennials include (Disabato-Aust):
- Baskets of gold (Aurinia saxatilis and cvs.)
- Bearded irises (Iris spp. and cvs.)
- Bergenias (Bergenia cordifolia and cvs.)
- Clustered bellflowers (Campanula glomerata and cvs.)
- Common rue (Ruta graveolens)
- Coral bells (Heuchera spp. and cvs.)
- Daylilies (Hemerocallis spp. and cvs.)
- Goatsbeards (Aruncus dioicus and cvs.)
- Hellebores (Helleborus orientalis and cvs.)
- Hostas (Hosta spp. and cvs.)
- Jacob's ladders (Polemonium caeruleum and cvs.)
- Japanese anemones (Anemone × hybrida cvs.)
- Lady's mantles (Alchemilla mollis and cvs.)
- Lambs' ears (Stachys byzantina and cvs.)
- Lavender cottons (Santolina chamaecyparissus and cvs.)
- Lungworts (Pulmonaria spp. and cvs.)
- Mulleins (Verbascum spp. and cvs.)
- Obedient plants (Physostegia virginiana and cvs.)
- Pearly everlastings (Anaphalis triplinervis and cvs.)
- Peonies (Paeonia spp. and cvs.)
- Red hot pokers (Kniphofia spp. and cvs.)
- Rodgersias (Rodgersia aesculifolia and cvs.)
- Rose mallows (Hibiscus moscheutos and cvs.)
- Scotch thistles (Onopordum nervosum and cvs.)
- Sea thrifts (Armeria maritima and cvs.)
- Wall germanders (Teucrium chamaedrys and cvs.)
- Wall rock cresses (Arabis caucasica and cvs.)
- Western bleeding hearts (Dicentra formosa and cvs.)
- Western mugworts (Artemisia ludoviciana and cvs.)
Off with their heads? It all comes down to the personal choice of the gardener and knowing the growing habits of each individual perennial. Two excellent online resources are:
http://www.gardengatemagazine.com/extras/58deadheadingGuide.php
http://www.finegardening.com/how-to/articles/off-with-their-heads.aspx
If you are a perennial gardener, I highly recommend two books that need to be in every perennial gardener's library: The Well Tended Perennial Garden by Tracy DiSabato-Aust and The Perennial Care Manual by Nancy J. Ondra.
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