Long-day plants are those that require longer daylight hours to flower and grow. Typically, they thrive when the duration of daylight exceeds 12 to 14 hours. These plants often bloom in late spring or early summer when the days are longer, making them well-suited for regions with extended daylight during these seasons. Examples of long-day plants include spinach, lettuce, and clover. Gardeners often use artificial lighting to extend the day length for these plants, especially in areas where natural daylight is limited. This technique helps maximize growth and flowering, ensuring a successful harvest.