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.
Step 3. Use pruning shears to cut back bougainvillea plants using the hard pinch technique immediately prior to moving them indoors if you live in a cold climate. Hard pinching is when a gardener removes almost all of the branches from a bougainvillea plant so it does not extend past the container.rune back bougainvillea in containers when the plants are finished blooming. Use pruning shears to cut back all of the stems so they reach just past the edges of the container.