If you have never contract back a perennial during the growing season , it can be a lilliputian shuddery to take the pruners to it . Here is the timing for some common plants .
After blooming
1.Bluestar(Amsoniaspp . and cvs . , Zones 3–9 )
2.Brunnera(Brunnera macrophyllaand cvs . , Zones 3–8 )
3.Columbine(Aquilegiaspp . and cvs . , Zones 3–8 )
4.Baptisia(Baptisiaspp . and cvs . , Zones 3–9 )
5.Coreopsis(Coreopsisspp . and cvs . , Zones 3–9 )
6.Geranium(Geraniumspp . and cvs . , Zones 3–8 )
7.Iris(Irisspp . and cvs . , Zones 3–9 )
8.Salvia(Salvia nemerosaand cvs . , Zones 4–8 )
9.Woodland phlox(Phlox divaricataand cvs . , Zones 4–8 )
Before blooming
10.Aster(Aster , Symphyotrichum , andEurybiaspp . and cvs . , Zones 3–8 )
11.Bee balm(Monardaspp . and cvs . , Zones 4–9 )
12.Culver ’s root(Veronicastrum virginicumand cvs . , Zones 4–8 )
13.Helianthus(Helianthusspp . and cvs . , Zones 4–9 )
14.Garden phlox(Phlox paniculataand cvs . , Zones 4–8 )
15.Goldenrod(Solidagospp . and cvs . , Zones 3–9 )
16.Mums(Dendranthemaspp . and cvs . , Zones 3–9 )
17.Tall sedums(Hylotelephiumspp . and cvs . , Zones 3–9 )
18.Toad lily(Tricyrtusspp . and cvs . , Zones 5–9 )
SOURCE : DiSabato - Aust , Tracy . The Well - Tended Perennial Garden . Timber Press , Portland , OR . 1998 .
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Bluestar (Amsoniaspp. and cvs., Zones 3–9).Photo: Steve Aitken
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Geranium (Geraniumspp. and cvs., Zones 3–8).Photo: Michelle Gervais
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Bee balm (Monardaspp. and cvs., Zones 4–9).Photo: Carol Collins
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Garden phlox (Phlox paniculataand cvs., Zones 4–8).Photo: Steve Aitken
Toad lily (Tricyrtusspp. and cvs., Zones 5–9).Photo: Brittany Carlson
