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McKay Nursery’s Suggestions: Handling established perennials that we grow & how to treat them for winter Amsonia/Blue Star – cut back fall or spring Aster – cut back fall or spring Astilbe – leave up for fall if you like to see the dried flower heads, or cut back fall or spring Butterfly Weed – cut back fall or spring Beebalm – trim to ground in fall and remove all leaves. Bleeding Heart – pull off dried leaves and stems after frost kills down. Brunnera – pull off dried foliage after frost kills it (prevents any leaf disease from over wintering on plants) Butteryfly Bush (a woody ornamental that is treated as a perennial here) – cut back in spring only Caryopteris (a woody ornamental that is treated as a perennial here) – trim back in spring only Catmint – cut back fall or spring Columbine – pull off dried foliage after frost kills it in either fall or early spring. Coneflower – leave seed heads up to feed birds, or fall or spring cut back Coreopsis – leave up for fall and cut back in spring only Daylily – cut back and pull off all foliage in fall (prevents any leaf disease from over wintering on plants or rodents from building in the old leaves) Fern – leave up for fall, cut back in spring Geranium – cut back in fall or spring Goldenrodleave up for winter interest, cut back either fall or spring Grasses – please leave all up for fall and don't cut back until spring, enjoy all winter. Heuchera (Coral Bells) and Heucherella – best left alone until spring, then in spring pull off only dried leaves, don't cut way back. Hosta – pull off old foliage after frost kills the leaves in fall, but wait until dried and it can be pulled and you don’t have to cut it Iris – cut back in fall or spring Jacob’s Ladder – cut back in fall or spring Ladysmantle – cut back fall or spring Lamium/Deadnettle – lightly rake off in spring Liatris /Blazing Star – cut back fall or spring Lungwort – cut back fall or spring Peony – cut back in fall very close to the ground and remove all stems and leaves Phlox – cut back in fall and remove all old foliage (prevents any leaf disease from over wintering on plants). Rudbeckia – cut back in fall or spring (the seed heads are great little bird feeders, but if they had diseased foliage, it’s best to cut off in fall and remove in fall) Russian Sage – cut back in spring Salvia– cut back fall or spring Sedum – cut back in fall or spring (look great in winter if you leave the taller varieties up)

Perennial Overwintering Suggestions letterhead

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Page 1: Perennial Overwintering Suggestions letterhead

McKay  Nursery’s  Suggestions:    

Handling  established  perennials  that  we  grow  &  how  to  treat  them  for  winter   Amsonia/Blue  Star  –  cut  back  fall  or  spring  Aster  –  cut  back  fall  or  spring  Astilbe  –  leave  up  for  fall  if  you  like  to  see  the  dried  flower  heads,  or  cut  back  fall  or  spring  Butterfly  Weed  –  cut  back  fall  or  spring  Beebalm  –  trim  to  ground  in  fall  and  remove  all  leaves.  Bleeding  Heart  –  pull  off  dried  leaves  and  stems  after  frost  kills  down.  Brunnera  –  pull  off  dried  foliage  after  frost  kills  it  (prevents  any  leaf  disease  from  over  wintering  on  plants)  Butteryfly  Bush  (a  woody  ornamental  that  is  treated  as  a  perennial  here)  –  cut  back  in  spring  only  Caryopteris  (a  woody  ornamental  that  is  treated  as  a  perennial  here)  –  trim  back  in  spring  only  Catmint  –  cut  back  fall  or  spring  Columbine  –  pull  off  dried  foliage  after  frost  kills  it  in  either  fall  or  early  spring.  Coneflower  –  leave  seed  heads  up  to  feed  birds,  or  fall  or  spring  cut  back  Coreopsis  –  leave  up  for  fall  and  cut  back  in  spring  only  Daylily  –  cut  back  and  pull  off  all  foliage  in  fall  (prevents  any  leaf  disease  from  over  wintering  on  plants  or  rodents  from  building  in  the  old  leaves)  Fern  –  leave  up  for  fall,  cut  back  in  spring  Geranium  –  cut  back  in  fall  or  spring  Goldenrod-­‐-­‐leave  up  for  winter  interest,  cut  back  either  fall  or  spring  Grasses  –  please  leave  all  up  for  fall  and  don't  cut  back  until  spring,  enjoy  all  winter.  Heuchera  (Coral  Bells)  and  Heucherella  –  best  left  alone  until  spring,  then  in  spring  pull  off  only  dried  leaves,  don't  cut  way  back.  Hosta  –  pull  off  old  foliage  after  frost  kills  the  leaves  in  fall,  but  wait  until  dried  and  it  can  be  pulled  and  you  don’t  have  to  cut  it  Iris  –  cut  back  in  fall  or  spring  Jacob’s  Ladder  –  cut  back  in  fall  or  spring  Ladysmantle  –  cut  back  fall  or  spring  Lamium/Deadnettle  –  lightly  rake  off  in  spring  Liatris  /Blazing  Star  –  cut  back  fall  or  spring  Lungwort  –  cut  back  fall  or  spring  Peony  –  cut  back  in  fall  very  close  to  the  ground  and  remove  all  stems  and  leaves  Phlox  –  cut  back  in  fall  and  remove  all  old  foliage  (prevents  any  leaf  disease  from  over  wintering  on  plants).  Rudbeckia  –  cut  back  in  fall  or  spring  (the  seed  heads  are  great  little  bird  feeders,  but  if  they  had  diseased  foliage,  it’s  best  to  cut  off  in  fall  and  remove  in  fall)  Russian  Sage  –  cut  back  in  spring  Salvia–  cut  back  fall  or  spring  Sedum  –  cut  back  in  fall  or  spring  (look  great  in  winter  if  you  leave  the  taller  varieties  up)  

Page 2: Perennial Overwintering Suggestions letterhead

Shasta  Daisy  –  cut  back  fall  or  spring  Thyme  (Creeping  Thyme  is  what  we  grow)  –  leave  alone  to  spring  then  rake  gently  Veronica  –  cut  back  in  fall  or  spring  Woadwaxen  –  cut  back  in  spring  like  you  would  a  Spiraea  Yarrow  –  Cut  back  fall  or  spring      I  hope  that  answers  any  questions  you  might  have.    Some  people  like  to  go  out  and  just  cut  everything  to  the  ground.    When  you  do  that,  you  have  nothing  to  look  at  all  winter  long  (and  winter  can  be  long  in  our  area).    Why  not  leave  some  of  these  plants  alone  and  enjoy  their  dormant,  spent  flower  heads  or  foliage  as  they  sculpt  the  snow  and  add  tons  of  winter  interest  to  the  landscape?      As  with  all  perennials,  it  is  always  best  to  clean  up  any  foliage  that  was  diseased  this  past  growing  season  as  that  will  help  eliminate  re-­‐infection  next  spring.    Perennials  love  a  fresh  application  of  mulch  in  fall,  as  do  most  deciduous  shrubs  as  well.    If  you  are  growing  tender  perennials  in  your  yard,  be  sure  and  give  those  plants  a  few  evergreen  boughs  or  a  covering  of  marsh  hay  after  the  ground  has  started  to  freeze  to  keep  the  ground  frozen  on  those  items  all  winter  long.      Freezing  and  thawing  of  perennials  can  cause  them  to  start  growing  before  they  really  should,  and  then  when  they  freeze  again,  it  can  cause  damage.    The  evergreen  boughs  or  hay  will  prevent  the  freezing  or  thawing,  and  will  prevent  the  damage.    Newly  planted  perennials  (especially  newly  planted  in  the  fall)  really  need  to  be  mulched  very  well  when  planted  around  the  plants,  and  then  also  mulched  with  evergreen  boughs  or  marsh  hay  to  prevent  these  plants  from  being  heaved  out  of  the  ground  by  that  freezing  and  thawing  process.    This  is  a  necessary  step  to  ensure  good  rooting  in  fall  and  to  help  them  best  over  winter.    That  is  the  reason  we  need  you  to  stop  doing  installations  of  perennials  by  the  end  of  October  –  so  they  have  a  chance  to  root  in  before  the  ground  freezes.        Fall  cut  back  should  not  happen  until  several  killing  frosts  have  helped  the  plants  to  go  dormant,  and  in  spring  please  cut  back  just  before  the  new  growth  begins.      If  you  have  any  specific  questions,  please  feel  free  to  call  or  e-­‐mail.  Thank  you,    McKay  Nursery  Company  www.mckaynursery.com  800.236.4242