Answer: Geraniums are actually shrubby and grow woodier with age although we usually grow them as smaller houseplants. Cutting them back will help force new growth. To keep them small and vigorous, and as an insurance policy, you might want to save some of the trimmings to make four to six inch long tip cuttings and root those. With careful pinching you can grow some nicely branched young and vigorous plants to replace the now woody originals -- although "clone" would maybe be a better word than replace.
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