Perennial Timing

Perennial	Sales Window (Flower)	Transplant	Starting Materials	Cold Treatment Vernalizaion- Cold Requirement (Wks)	Cold Treatment Vernalizaion- Duration (Wks)	Finishing Schedule and Guildline- Finishing Time	Finishing Schedule and Guildline- Temperature (24 hour Ave)	Finishing Schedule and Guildline- Photoperiod (Day Length)
Aubrieta hybrids	Early Spring	Early Fall - 6"/Gal Spring - 4-5 inch	Fresh Liners Vernalized Liners	Cold Required	4 to 6	4-5 inch - 6-7 wks 6"/Gal - 7-8 wks	60-64º F	Day Neutral
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)
Iberis Absolutely Amethyst	Mid to Late Spring	Late Spring to Early Fall Spring - 4-5 inch	Fresh Liners Vernalized Liners	Cold Required	6	4-5 inch - 6-8 wks 6"/Gal - 8-10 wks	60-64º F	Day Neutral
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