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.
Robert Smaus. Attention all Californians: Fall is the best time for planting! Itâs almost as easy as falling down: Put your plants in the ground, watch it rain, watch your plants grow, watch your plants explode into spring bloom. One advantage of fall planting is that the soil is still warm from summer, so roots begin growing immediately. 2  The later in fall you wait to plant, the cooler the soil will be, and youâll lose that advantage.