The simplest and the most used design in an herb garden is the form of a cartwheel. You can build your own herb wheel very easy. You will need the following materials to build the herb wheel: string, canes, sand, dry concrete mix, bricks, mortar and topsoil to fill the wheel for planting your herbs and of course the herbs. Remember that this type of design looks more impressive when is viewed from above, so make sure you find a place for it so it may be overlooked from an upper window or a slope. Also try to use plants that have the same growing rhythm or else some will grow faster and spoil the design.