2. Long Day Plant

This is a picture of spinach. Spinach is an example of a long day plant. A long day plant is a plant that flowers when it is exposed to sunlight for a longer time than its critical day length. It needs a long light period and a short dark period. For spinach, it will flower with over twelve hours sunlight. This is why spinach planted for the purposes of food is usually planted during the fall or very early spring. Otherwise, if it is planted in the summer when the days are longer, it would flower because it is a long day plant.