Knot gardens are symmetrically-designed gardens employed in formal landscaping, using geometric patterns, in which control is exercised by the precise use of edging plants. Shrubbery such as English boxwood often plays a dominant role in them, since it can be pruned to conform to precise measurements. Herb plants are also frequently used.
The origin of this landscaping style is European. Knot gardens gained popularity with the nobility during the European Renaissance and are especially associated with the grand English estates.