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.
The best collard greens growing environment is one with moist, fertile soil. The area chosen for collard greens planting should be in full sun. Plant seeds in rows at least 3 feet apart, as growing collard greens get large and need room to grow. Thin seedlings to 18 inches apart for adequate room in the rows.