A knot garden always makes a stunning feature as the pattern is very satisfying to the eye. The historic ideal consisted of four elements, each of a different pattern, but you can start with something simpler in the beginning. Start with a small area, about 3-4 square meters will be large enough to contain an interesting pattern.
Remember that this kind of design looks best if viewed from above so be careful when you choose the place for your knot garden. A best place and also an interesting feature will be in the center of a sunken garden. Make sure you choose a sunny position as well and a well-drained soil. To do the job effectively you need to choose evergreen plants with small leaves, dense growth and the ability to withstand close clippings.