Living things respond to their environment. Response to stimuli is an important characteristic of life. Anything that causes a living organism to react is called a stimulus (plural is stimuli) Stimuli can be external or internal. For instance, if you feel like going to the bathroom, it is an internal stimulus that is controlled by the brain.
Planting leafy green vegetables is easy, but itâs all in the timing. Knowing when to plant greens (such as spinach, kale, and lettuce) depends on your climate and if the leaf vegetables are heat- or cold-tolerant. Greens grow year-round in areas with mild summers and winters, such as the West Coast. For most other areas, spring and fall are the best times to grow greens.
Green tomatoes can continue to mature off the vine. The end of the growing season often arrives with tomatoes still ripening on the vine. Before frost ruins that crop of green tomatoes, pick some and bring them indoors to finish ripening. Green tomatoes can ripen and turn red off the plant, although the maturity of the fruit and indoor conditions determine which fruits will ripen best.