Irises and other ____ plants flower only when the hours of darkness fall below a critical value,typically in summer.

Name: Irises and other ____ plants flower only when the hours of darkness fall below a critical value,typically in summer.
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Long-day plants, such as irises, flower when the nights are short and the days are long, typically during the summer months. This is because their flowering is triggered by a decrease in the duration of darkness to below a critical threshold.

Irises and Other ____ Plants Flower Only When the Hours