Focusing primarily on both the understanding of our natural and man-made environments, environmental science degrees draw from diverse fields of studies and require a strong background in the more traditional sciences: biology, physics, chemistry, geography, ecology, and even biotechnology.
When and how to pinch back mums. If you decide to prune your mums, you can start pinching stems in spring when the plants have reached a height of about 6 inches. To pinch them back, simply grab a stem between your thumb and index finger about 2 to 3 inches above the base of the plant and just above a leaf and pinch it off.
Add a layer of mulch on top of dead foliage for the winter and then remove it in early spring. In the spring, once new growth is seen, cut back dead foliage to 3 to 4 inches above ground. From spring until the beginning of July, mums can be cut back 2 to 3 inches once they reach 6 to 8 inches tall.