Undershrubs are low-growing, resilient plants that are popular in landscaping. Also known as sub-shrubs, these plants typically grow up to three feet in height and have woody stems. A variety of synonyms exist for the term undershrub, including dwarf shrub, low shrub, undersized shrub, and bushy herb. Other words that can be used to describe undershrubs include groundcover, creeping shrub, and mat-forming shrub. Whatever term you use to describe them, undershrubs are a great addition to any garden or landscaping project due to their hardiness, low maintenance requirements, and attractive appearance.