Keep water off the foliage because moist foliage favors the development of disease. Mulch the bed to maintain moisture levels and keep the soil cooler in summer. Soil for geraniums should be well-drained. Geraniums respond well to fertilizer and are stunted and yellowed if not provided enough nitrogen. Mix the fertilizer into the soil well.
Geraniums usually require additional fertilizer during the growing season every four to six weeks.
Take dead flowers off the plant to prolong flowering. Pinch to encourage well-branched, full plants. When growing geraniums in containers, choose large pots to hold enough soil for a good root system, and to contain enough water to prevent wilting. Repot into larger containers if they grow so large that they wilt frequently. Select containers with adequate drainage holes, plant in a well-drained soil mix and do not allow pots to sit in water.