PERENNIALS / FORCING GUIDE
FORCING GUIDE FOR FIRST YEAR FLOWERING PERENNIALS FOR 2 MAJOR DATES IN NORTH AMERICA* (QUICK ANNUAL CYCLE) GENUS SPECIES SERIES/VARIETY USDA HARDINESS ZONE FORCING FOR SPRING (WEEK 19) IDEAL SOWING WEEK PLUG SIZE* PLUG BULKED UNDER NATURAL SD OR <=12 HR GROW WEEKS
SUPPLEMENTAL LD (14 HR OR NI) REQUIRED AFTER TRANSPLANT**
Avignon Early Blue
LAVANDULA
6-8
46-47 288
7
No
angustifolia
Blue Spear
LAVANDULA
6-8
-
-
-
-
angustifolia
Ellagance Purple
LAVANDULA
5b-8a 46-47 288
7
No
angustifolia
Lavance Deep Purple
LAVANDULA
5-8
-
-
-
-
angustifolia
Bandera
LAVANDULA
7-10
46-47 288
7
No
stoechas
Madonna
LEUCANTHEMUM
3b-9a -
-
-
-
x superbum
White Lion
LEUCANTHEMUM
3b-9a 47-48 288
6
No
x superbum
Starship
LOBELIA
6-10
45-46 288 to 72+ 13-15 weeks; 10-hour SD bulk to 10 leaves 44-45 288 to 72+ 14-16 weeks; 10-hour SD bulk to 10 leaves
Yes
speciosa
Starship Scarlet Bronze Leaf
LOBELIA
6-10
Yes
speciosa
Kirigami
ORIGANUM
5b-8a 52-1 128
6-7
Yes
hybrida
Bluesette
PEROVSKIA
4-9
50-51 288+
6-8
No (if DLI > 10 mol/day)
atriplicifolia
Blue Steel
PEROVSKIA
4-9
48-49 128
6-8
No
atriplicifolia
GoldBlitz
RUDBECKIA
3-9
40-42 288 to 50+ 15-16 weeks; SD from 2 to 10 true leaves 40-42 288 to 50+ 15-16 weeks; SD from 2 to 10 true leaves
Yes
fulgida
Goldsturm
RUDBECKIA
3-9
Yes
fulgida
New Dimension
SALVIA
4-8
1-2 128
7
Yes
nemorosa
Salvatore Blue
SALVIA
4-8
1-2 128
7
No
nemorosa
Patio
SALVIA
8-10
1-2 128
7
Yes
patens
Blue Note
SCABIOSA
5-7
49-51 128
8-9
No
columbaria
Spectacular
SEDUM (HYLOTELEPHIUM)
3-9
44-46
72
8-9 weeks until 8 leaves
Yes: at 16 hours (or NI) for 5 weeks; SD forcing max 13 hours for colour for 8 weeks No; SD forcing max 13 hours for colour for 8 weeks
spectabile
44-46
72 preforced
8-9 weeks until 8 leaves, then 5 weeks at 16 hours (or NI)
Buenos Aires
VERBENA
7-9
-
-
-
-
bonariensis
Santos Purple
VERBENA
7-11
49-50 128
8
No
rigida
FORCING GUIDE FOR FIRST YEAR FLOWERING PERENNIALS FOR 2 MAJOR DATES IN NORTH AMERICA* SD = Short Day (12 hours or shorter, except Lobelia is 10 hours) • LD = Long Day • ADT = Average Daily Temperature
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FORCING GUIDE / Additional culture info online • panamseed.com/culture
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