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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 ).

Environmental Control of Flowering and Growth of Achillea millefolium L. `Summer Pastels'