Pruning geraniums is necessary to keep the plant healthy and encourage additional flower blooms throughout the growing season. Pruning also helps to shape the plants properly and keep them free from disease.
Geraniums should be pruned back on the main stems to three leaves in the spring to promote healthy new plant growth, and should be pruned back again in the fall where geraniums can be grown as perennials. During the growing season when flowers have fully bloomed and started to whither, the flower petal and stems should be removed so the plant can grow new blooms. This process is referred to as "deadheading" and is a common gardening technique for flowering plants. Dead leaves should also be removed throughout the year to avoid disease.