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.
Pinching Petunia Blooms. 1  1. Check what type of petunias you are growing. Find the seeds or the plant markers. 2  2. Start with pinching petunia blooms. If you have never deadheaded a flower before, you may feel more comfortable pinching off spent flowers than cutting the plant itself. 3  3. Get close to the plant, like you are weeding.