Have you noticed that different food plants are available at different times of the year? In summer we enjoy watermelon and mangos, and in winter we feast on sweet and tangy citrus fruits. Most plants are seasonal, meaning they prefer a specific time of year to grow.
umans usually sense a change in season by noticing differences in the temperature, but plants pick up changes in the day length or what scientists call the photoperiod. Seasonal plants use a special chemical that senses light