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Perennial Timing

Perennial

Sales Window
(Flower)

Transplant Starting
Materials

Cold Treatment
Vernalization-

Cold
Requirement
(Wks)

 

Cold Treatment
Vernalization-

Duration
(Wks)

Finishing Schedule and Guideline-

Finishing Time
Finishing Schedule and Guideline-

Temperature (24 hour Ave)
Finishing Schedule and Guideline-

Photoperiod (Day Length)
Baptisia Late Spring to Early Summer Fall to Early Spring Bareroot

Cold Required (Fall Plantings Only)     

8 to 10  6"/Gal - 8-12 wks  55-60º F  Day Neutral
Gypsophila Festival Star Late Spring to Summer Late Summer or Spring Fresh or Vernalized Liners    Cold Beneficial 6 to 9
 
4-5 inch - 7-8 wks 6"/Gal - 8-9 wks  65-68º F Long Day Required
Heliopsis  ‘Tuscan Sun’ Late Spring to Summer Late Summer or Spring Fresh or Vernalized Liners  No Cold Required 0

 4-5 inch - 8-9 wks

6”/Gal - 9-11 wks

63-68º F Long Day Required
Hemerocallis Late Spring to Early Summer Summer to Early Spring Bareroot Cold Beneficial   8-10  All Sizes - 9-12 wks  63-68º F  Day Neutral (Flowers best under
long days with
high light
intensities)
Heuchera Early Spring to Fall (Summer and Fall - Foliage Only) Late Summer to Late Spring Fresh or Vernalized Liners    Cold Required (Only for Flowering)      6 to 9
 
4-5 inch - 5-6 wks 6”/Gal - 7-9 wks 65-68º F Day Neutral
Hibiscus  Summer  Spring Liners or Bareroot No Cold Required      0  6”/Gal or Larger 9-12 wks  68-75º F  Long Day Required
Hosta  Late Spring to Fall (Primarily grown as a foliage item) Early Summer to Spring Fresh or Vernalized Liners     Cold Required (Only for Flowering)     8 to 12 4-5 inch - 6-8 wks 6"/Gal - 8-10 wks  60-65º F Long Day Required (For Vegetative Growth)
Lamium maculatum Pink Chablis Mid Spring to Fall Late Summer to Early Summer Fresh or Vernalized Liners No Cold Required    0
 
 4-5 inch - 4-6 wks 6"/Gal - 5-7 wks  60-65º F Day Neutral
Leucanthemum Late Spring to Summer

Late Summer/Early Fall

Spring

Fresh Liners

Fresh or Vernalized Liners

‘Banana Cream’ - Cold Required Others - Cold Beneficial     6 to 9  4-5 inch - 6-8 wks 6"/Gal - 7-9 wks 65-68º F Long Day Beneficial
Oenothera hybrid Lemon Drop Late Spring to Fall Late Summer to Early Summer Fresh or Vernalized Liners Cold Beneficial   6 to 9  4-5 inch - 4-6 wks 6"/Gal - 5-7 wks  60-65º F  Long Day Beneficial
Phlox paniculata ‘Shockwave’ Late Spring (Foliage) to Summer (Flower) Late Summer or Spring Fresh or Vernalized Liners Bareroot Cold Beneficial 6 to 9 4-5 inch - 6-8 wks (Foliage) 6"/Gal - 10-12 wks  65-68º F  Long Day Required
Panicum Late Spring to Summer (Foliage) Late Summer to Fall (Flower) Summer to Spring Fresh or Vernalized Liners Cold Required (Only for Flowering) 10 to 12 6"/Gal or Larger 7-9 wks (Foliage) 12-14 wks (Flower)  65-72º F  Long Day Required
Pennisetum ‘Desert Plains’ Late Spring to Summer (Foliage) Late Summer to Fall (Flower) Summer to Spring Fresh or Vernalized Liners Cold Required (Only for Flowering) 10 to 12 6"/Gal or Larger 6-7 wks (Foliage) 12-14 wks (Flower)  65-72º F  Long Day Required
Sedum Late Spring to Summer (Foliage) Late Summer to Fall (Flower) Late Summer to Spring Fresh or Vernalized Liners Bareroot No Cold Required    0 Foliage - 4-5 inch 6-8 wks 6"/Gal - 8-10 wks Flower - 12-16 wks 60-68º F Long Day Required
Veronica Late Spring to Summer Late Summer or Spring Fresh Liners (Summer only) Vernalized Liners Bareroot Cold Required (Will NOT Flower without Vernalization) 9 to 12
 
4-5 inch - 6-8 wks 6"/Gal - 8-10 wks 65-68º F  Day Neutral
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