SEED PROPAGATION
Calendula COSTA ™ OP Calendula officinalis REC TRAY FORMS PLUG TIME
SEEDS/CELL SEED COVER GERM TIME
SOIL TEMP
GERM LIGHT
MEDIA pH/EC
288-cell tray
Raw
3–4 weeks
1
Yes
5–10 days
70–72 °F (21–22 °C)
Not required for germination pH: 5.5–5.9
SME 0.5–0.75 mS/cm
Comments: Grow on the cool side. Calendulas are not recommended for fall crops where cool conditions cannot be maintained.
Celosia BRIGHT SPARKS ™ OP Celosia plumosa erecta REC TRAY FORMS PLUG TIME
SEEDS/CELL SEED COVER GERM TIME
SOIL TEMP
GERM LIGHT
MEDIA pH/EC
288-cell tray
Raw
4–5 weeks
1
Yes
2–4 days
70–75 °F (21–24 °C)
Required for germination
pH: 5.5–5.9 SME 0.9–1.3 mS/cm
Comments: Bright Sparks celosia will flower early under short days, so to allow bulking of the plug provide a 14-hour day length during propagating.
Cleome SPARKLER ™ 2.0 F1 Cleome hassleriana REC TRAY FORMS PLUG TIME
SEEDS/CELL SEED COVER GERM TIME
SOIL TEMP
GERM LIGHT
MEDIA pH/EC
288-cell tray
Raw
3–4 weeks
1
Yes
4–6 days
80–85 °F (26–30 °C) days 68–70 °F (20–21 °C) nights
Required for germination
pH: 5.5–5.9 SME 0.9–1.3 mS/cm
Comments: A 15 °F (-9 °C) positive DIF is recommended for best germination results. Cleome is a heavy feeder; start feeding in the plug about 2 weeks after sowing.
Cosmos APOLLO ™ OP Cosmos bipinnatus REC TRAY FORMS PLUG TIME
SEEDS/CELL SEED COVER GERM TIME
SOIL TEMP
GERM LIGHT
MEDIA pH/EC
288-cell tray
Raw
4–5 weeks
1
Yes
3–4 days
61–65 °F (16–18 °C)
Not required for germination pH: 5.5–5.9
SME 0.25–0.5 mS/cm
Comments: Cosmos will flower early under short days, so to allow bulking of the plug provide a 14-hour day length during propagating.
Cuphea SRIRACHA ™ F1 Cuphea llavea REC TRAY FORMS
PLUG TIME
SEEDS/CELL SEED COVER GERM TIME
SOIL TEMP
GERM LIGHT
MEDIA pH/EC
288-cell tray
Raw
3.5–4 weeks
1
Yes
3–5 days
70–75 °F (21–24 °C)
Not required for germination pH: 5.8–6.2
SME 0.5–0.75 mS/cm Comments: Only the first application of plant growth regulators (PGRs) is necessary for the plug. After two weeks, you can alternate moisture levels between 2 and 4 to help tone the plugs. Provide supplemental lighting if possible if DLI is less than 8 mols/day.
Dahlia FRESCO ™ OP Dahlia hybrida REC TRAY FORMS
PLUG TIME
SEEDS/CELL SEED COVER GERM TIME
SOIL TEMP
GERM LIGHT
MEDIA pH/EC
288-cell tray
Raw, Coated
3–4 weeks
1
Yes
5 days
70 °F (21 °C)
Not required for germination pH: 5.5–5.9
SME 0.5–0.75 mS/cm
Comments: Provide day extension lighting to 12–14 hours/day to help prevent premature flower bud set.
Dahlia HARLEQUIN ™ OP Dahlia hybrida REC TRAY FORMS
PLUG TIME
SEEDS/CELL SEED COVER GERM TIME
SOIL TEMP
GERM LIGHT
MEDIA pH/EC
288-cell tray
Raw, Coated
3–4 weeks
1
Yes
5 days
70 °F (21 °C)
Not required for germination pH: 5.5–5.9
SME 0.5–0.75 mS/cm
Comments: Provide day extension lighting to 12–14 hours/day to help prevent premature flower bud set.
Dianthus DIABUNDA ® F1 Dianthus × barbatus REC TRAY FORMS PLUG TIME
SEEDS/CELL SEED COVER GERM TIME
SOIL TEMP
GERM LIGHT
MEDIA pH/EC
288-cell tray
Pelleted
5–6 weeks
1
Yes
5 days
72–74 °F (22–23 °C)
Not required for germination pH: 5.5–5.9
SME 0.9–1.3 mS/cm Comments: Providing high light and dropping the temperature to an average daily temperature (ADT) of 60 °F (21 °C) will reduce the need for plant growth regulators (PGRs). Day extension lighting to 14 hours will hasten flowering of the finished plant.
G R O W E R S U C C E S S G U I D E 2 0 2 2 – 2 0 2 3 | A N N U A L S
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