Bell pepper plants typically grow to a height of 2-4 feet (0.9-1.2 m) and between 18 and 24 inches (45-60 cm) across, although some varieties may be shorter or taller. The exact height of a bell pepper plant will depend on factors such as the variety, the growing conditions, and the care provided. In general, bell pepper plants are compact and do not require extensive staking or support.