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.
Dandelion greens make a healthy addition to summer salads. Most people regard the dandelion (Taraxacum officinale) as an invasive weed that takes over lawns and flower beds every spring. While in many cases this is true, dandelions can also be planted as a food source.. Sow your dandelion seeds 1/4 to 1/2 inch deep in your seedbed in mid-to late spring, spacing the seeds 2 to 3 inches apart. Dandelion seeds require a great deal of light to germinate, so do not cover the seeds with soil.