Answer: It's natural for geraniums to lose their older leaves. As the leaves die, they return food to the roots of the plants. Those leaves that are turning yellow, even are probably just going through the natural process of dying. The leaves with the brown margins are indicating to you that they're unhappy in their present environment. Over watering or over fertilizing can cause those symptoms. Geraniums like lots of sunshine and low relative humidity. They do best with plenty of air circulation around each plant, too. Why not pinch off the affected leaves and water less often? Both these activities will help promote healthy new leaf growth. Best wishes with your geraniums.
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