Natural Photoperiod by Latitude For the best quality plants, provide day-extension or night interruption lighting from Sept. 15 to April 1.
17
VANCOUVER, B.C.
16
MINNEAPOLIS, MN
15
COLUMBUS, OH
Latitude (°N)
14
CHARLOTTE, NC
25 30 35 40 45 50
13
HOUSTON, TX
12
MIAMI, FL
11
10
9
PROVIDE LONG-DAY LIGHTING
PROVIDE LONG-DAY LIGHTING
8
1/1 2/1 3/4 4/4 5/5 6/5 7/6 8/6 9/6 10/7 11/7 12/8 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Date
Sanguna ® Banana Candy Petunia Container: 1.42 L (6” pot) Average Daily Temperature: 67.7 °F (19.9 °C) DLI: 8.1 mols/day
FINISH PHOTOPERIOD
9.5 hrs
10.5 hrs
11.5 hrs
13.5 hrs
WEEKS TO FLOWER
7
7.5
5.5
5.5
FLOWER NO. DECREASE VERSUS LONG DAYS
-80%
-88%
0%
–
Photo taken 7.0 weeks after transplant. Flower count data taken 7.0 weeks after transplant. = Miminum Photoperiod Recommendation Our MPR recommendations assume a daily light integral (DLI) of 10-15 mols·m -2 ·d -1
GROWER SUCCESS GUIDE 2024–2025
135
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