Results of Supplemental Lighting to Improve Winter Rooting of Evergreen Cuttings
Gail F. Berner
Goal: To improve rooting success of winter propagated hardwood evergreen cuttings, and to reduce unacceptable levels of variability in rooting from year to year.
Location: Grand Haven, Michigan, approximately 5 miles from Lake Michigan. Days are short with frequent cloud cover from November-February.
Rationale: Despite a lack of data for minimum required light intensity to root evergreens, Dr. Paul Fisher of Young Plant Research recommends a minimum Daily Light Integral (DLI) of 3–5 mol·m-2·d-1 (pers. commun. 16 Oct. 2008).
Monitored greenhouse 2008 DLI values were found to be well below target values January until March, (Fig. 1).
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