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Environmental Control of Flowering and Growth of Achillea millefolium L. `Summer Pastels'
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Achillea millefolium `Summer Pastels' is a qualitative long-day plant with a critical photoperiod between 12 and 16 hours at 18C. Plants grown under a 16-hour photoperiod flowered after 27 days, while those under 8 hours remained vegetative. Shoot dry weight was not affected by photoperiod. Low temperature (10C) delayed the time of flower bud formation and anthesis by ≈20 days. Low irradiance (100 μmol·m–2·s–1) delayed flowering and resulted in lower shoot dry weight, while moderate shading (200 μmol·m–2·s–1) did not significantly affect flowering time and growth compared with high irradiance levels (300 μmol·m–2·s–1).
American Society for Horticultural Science
Title: Environmental Control of Flowering and Growth of Achillea millefolium L. `Summer Pastels'
Description:
Achillea millefolium `Summer Pastels' is a qualitative long-day plant with a critical photoperiod between 12 and 16 hours at 18C.
Plants grown under a 16-hour photoperiod flowered after 27 days, while those under 8 hours remained vegetative.
Shoot dry weight was not affected by photoperiod.
Low temperature (10C) delayed the time of flower bud formation and anthesis by ≈20 days.
Low irradiance (100 μmol·m–2·s–1) delayed flowering and resulted in lower shoot dry weight, while moderate shading (200 μmol·m–2·s–1) did not significantly affect flowering time and growth compared with high irradiance levels (300 μmol·m–2·s–1).
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