Answer: Geraniums like heat, full sunshine, and soil that's on the dry side so I think your plants are in a great location. Snap off the dying flowers and your plants will produce new flowers; snap off the yellowing leaves, too. Geraniums typically lose the oldest leaves (those near the bottom of the plant). If you snap them off the stem rather than cut them off, they will usually produce healthy new leaves where the old ones were. To keep your plants bushy, pinch out the growing tips and they will branch out even more.
Best wishes with your geraniums!
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