Schedule the pruning during the late winter months. Trimming the shrub during this timeframe rids it of leggy limbs that grew too long during the active growing season. Pruning them gives the hibiscus a bushier appearance.
Trim any leggy limbs that detract from the pleasing shape of the hibiscus bush. Do this with sharp, clean pruning shears.
Cut off any hibiscus limbs that experienced damage due to disease or weather conditions. This type of plant tolerates heavy trimming well.
Prune the hibiscus heavily if you want to maintain a small size. Extensive pruning does not harm this hardy shrub. The only detrimental effect is that it may take longer to bloom, since the heavy trimming removes flower buds. Older varieties may grow up to 15 feet tall and live four or five decades.