PERENNIALS | SEED PROPAGATION
Iberis sempervirens Candy Tuft WHISTLER ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
7–8 weeks
Cold Required
Lavandula angustifolia English Lavender SCENT ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
6–8 weeks
Pinch 7–12 days before transplant. Use primed seed to improve germination uniformity and overcome any dormancy issues. Grow plugs at less than 13.5 hours.
First Year Flowering
Lavandula stoechas Spanish Lavender CASTILLIANO 2.0 ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
9–10 weeks
If needed, spray B-Nine ® WSG at 1,500–2,500 ppm. Use care when applying vermiculite covering to trays, as covering too heavily will suppress germination. Pinch plants 10 days prior to transplant if growing in a larger tray size or using less seeds per cell to increase branching in plugs.
First Year Flowering
Lavandula stoechas Spanish Lavender VIOLETA ™ XL
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
9–10 weeks
Grow plugs at less than 13.5 hours of day length to avoid early flower initiation.
First Year Flowering
Papaver nudicaule Iceland Poppy SPRING FEVER ®
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
6–7 weeks
If necessary, spray with B-Nine ® WSG at 2,500 ppm. Keep media pH <6.0 to prevent iron deficiency symptoms.
First Year Flowering
Platycodon grandiflorus Balloon Flower TWINKLE ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
5–6 weeks
If needed, spray B-Nine ® WSG at 1,500–3,750 ppm. Grow plugs under short day conditions to allow plants to bulk up prior to flowering.
First Year Flowering
Pritzelago alpina Chamois Cress ICECUBE ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
7–8 weeks
Keep trays covered with light fabric (Reemay ® ) for approximately two weeks after sowing for improved germination and uniformity.
Cold Required
Salvia x superba Salvia MERLEAU ®
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
5–6 weeks
First Year Flowering
GROWER SUCCESS GUIDE 2026–2028
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