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Perennial Timing

Perennial

Sales Window
(Flower)

TransplantStarting
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)
BaptisiaLate Spring to Early SummerFall to Early SpringBareroot

Cold Required (Fall Plantings Only)     

8 to 10 6"/Gal - 8-12 wks 55-60º F Day Neutral
Gypsophila Festival StarLate Spring to SummerLate Summer or SpringFresh or Vernalized Liners   Cold Beneficial6 to 9
 
4-5 inch - 7-8 wks 6"/Gal - 8-9 wks 65-68º FLong Day Required
Heliopsis  ‘Tuscan Sun’Late Spring to SummerLate Summer or SpringFresh or Vernalized Liners No Cold Required0

 4-5 inch - 8-9 wks

6”/Gal - 9-11 wks

63-68º FLong Day Required
HemerocallisLate Spring to Early SummerSummer to Early SpringBarerootCold Beneficial  8-10 All Sizes - 9-12 wks 63-68º F Day Neutral (Flowers best under
long days with
high light
intensities)
HeucheraEarly Spring to Fall (Summer and Fall - Foliage Only)Late Summer to Late SpringFresh or Vernalized Liners   Cold Required (Only for Flowering)     6 to 9
 
4-5 inch - 5-6 wks 6”/Gal - 7-9 wks65-68º FDay Neutral
Hibiscus Summer SpringLiners or BarerootNo 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 SpringFresh or Vernalized Liners    Cold Required (Only for Flowering)    8 to 124-5 inch - 6-8 wks 6"/Gal - 8-10 wks 60-65º FLong Day Required (For Vegetative Growth)
Lamium maculatum Pink ChablisMid Spring to FallLate Summer to Early SummerFresh or Vernalized LinersNo Cold Required   0
 
 4-5 inch - 4-6 wks 6"/Gal - 5-7 wks 60-65º FDay Neutral
LeucanthemumLate 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 wks65-68º FLong Day Beneficial
Oenothera hybrid Lemon DropLate Spring to FallLate Summer to Early SummerFresh or Vernalized LinersCold 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 SpringFresh or Vernalized Liners BarerootCold Beneficial6 to 94-5 inch - 6-8 wks (Foliage) 6"/Gal - 10-12 wks 65-68º F Long Day Required
PanicumLate Spring to Summer (Foliage) Late Summer to Fall (Flower)Summer to SpringFresh or Vernalized LinersCold Required (Only for Flowering)10 to 126"/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 SpringFresh or Vernalized LinersCold Required (Only for Flowering)10 to 126"/Gal or Larger 6-7 wks (Foliage) 12-14 wks (Flower) 65-72º F Long Day Required
SedumLate Spring to Summer (Foliage) Late Summer to Fall (Flower)Late Summer to SpringFresh or Vernalized Liners BarerootNo Cold Required   0Foliage - 4-5 inch 6-8 wks 6"/Gal - 8-10 wks Flower - 12-16 wks60-68º FLong Day Required
VeronicaLate Spring to SummerLate Summer or SpringFresh Liners (Summer only) Vernalized Liners BarerootCold Required (Will NOT Flower without Vernalization)9 to 12
 
4-5 inch - 6-8 wks 6"/Gal - 8-10 wks65-68º F Day Neutral
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