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.
Pinks (Dianthus) are another perennial that can wait for springtime cutting. In warmer climates, these plants will give you beautiful blooms in spring and fall, and they keep their looks throughout winter. Springtime is the right time to cut back your butterflybush (Buddleja davidii), too.You can cut this shrubby perennial back when you start to see new growth at the base of the plant, which can happen as early as February in some parts of the country.ure, there are a few perennials thatâll weather winter better if they keep their foliage, but if you trim your black-eyed Susans in fall, the garden police wonât show up at your door. If you wait until spring to cut back your daylilies, itâll just be a little more work for you later.