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.
Pruning Basics. General pruning of mums begins with using your thumb and forefinger to remove the tops of new shoots that are 3 to 4 inches long, leaving two or three leaves on each shoot. That task needs be done roughly one to four times each month, but don't prune the shoots after July 15 or Aug. 1 at the latest.