PERENNIALS | SEED PROPAGATION
Delphinium elatum Larkspur DELPHINA ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
7–8 weeks
If needed, sprays of B-Nine ® WSG at 1,500–3,700 ppm or a Bonzi ® spray at 3–5 ppm to tone plugs. Once germinated, grow plugs at cool temperatures for best quality.
First Year Flowering
Delphinium elatum Larkspur EXCALIBUR ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
7–8 weeks
If needed, sprays of B-Nine ® WSG at 1,500–3,700 ppm or a Bonzi ® spray at 3–5 ppm may be used to tone plugs. Once germinated, grow plugs at cool temperatures for best quality.
First Year Flowering
Delphinium grandiflorum Larkspur HUNKY DORY ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
6–7 weeks
If needed, sprays of B-Nine ® WSG at 2,500 ppm or a Bonzi ® spray at 5 ppm can be used to tone plugs. While light is not necessary for germination it is beneficial to prevent stretch in low light conditions.
First Year Flowering
Dianthus barbatus Sweet William BARBARINI ®
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
6–7 weeks
Beneficial to treat with either B-Nine ® WSG spray at 2,500 ppm or Bonzi ® spray at 5 ppm to tone plugs. To hasten flowering provide 14 hours or more of supplemental lighting in the plug stage.
First Year Flowering
Digitalis purpurea Foxglove CAMELOT ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
6–7 weeks
If necessary, plants will respond to sprays of B-Nine ® WSG at 2,500–3,500 ppm or a Sumagic ® spray at 3 ppm.
First Year Flowering
Doronicum orientale Leopard’s Bane LEONARDO ™ COMPACT
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
7–8 weeks
Cold Required
Echinacea purpurea Coneflower PRAIRIE SPLENDOR ™ / PRAIRIE SPLENDOR ™ COMPACT / PRAIRIE BLAZE ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
6–7 weeks
Grow plugs under short day conditions (<12 hours) to allow for bulking. Then provide long days to initiate flowering after approximately 7 true leaves are showing. Configure ® applied as a spray 1 to 2 times at 300–600 ppm has been shown to increase basal branching with little effect on plant height.
First Year Flowering
Erysimum hybridum Wallflower CANARIES ™
CULTURE YOUNG PLANT
VERNALIZATION REQUIREMENT
PLUG GROW TIME
COMMENTS
REQUIREMENT
6–7 weeks
When growing with a 9–10 week crop schedule, it is important to provide >14 hours of supplemental lighting in plug stages. When growing with a longer, cooler production schedule, the extra day length is not needed.
Cold Beneficial
GROWER SUCCESS GUIDE 2026–2028
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