This will make possible the choosing of most suitable varieties for your growing conditions.

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Flower:  F = Fall; W = Winter; S = Spring; SU = Summer

Temperature:
C  =  Cool growing variety for a cool greenhouse or growing space - 10 degrees at night, 15-18 degrees during daytime, 22 degrees on sunny days is ideal .

I   =  Intermediate temperature range is for this plant - 15 degrees at night, 18-20 degrees during daytime, 24 on sunny days.

W =  Warm growing means an ideal temperature of 18 degrees at night, 22 during the daytime, and 24 degrees F with sun.

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