Mattson, N.S.; Erwin, J.E. 2005. The impact of photoperiod and irradiance on flowering of several herbaceous ornamentals. Scientia Horticulturae. 104(3): 275-292.

Mattson, N.S.; Erwin, J.E. 2005. The impact of photoperiod and irradiance on flowering of several herbaceous ornamentals. Scientia Horticulturae. 104(3): 275-292.

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