Deadheading is just a gardening term for cutting or snapping off spent flowers. The plant looks better when you get rid of them. Also, because the goal of all flowering plants is to stop flowering and produce seed (in the case of rosebushes, to make rose hips), deadheading thwarts the process. So the plant is fooled into making more flowers. Deadhead away!
Whenever you see badly damaged, diseased, or dead leaves, remove them. To be on the safe side, throw them in the trash rather than in the compost pile. Otherwise, the leaves may spread disease.
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