A grass topper is a tractor-mounted rotary cutting attachment used to control long grass, weeds, rushes and light scrub on pasture, paddocks and field margins. It cuts vegetation to a more even height rather than producing a fine lawn finish. Topping is commonly used after grazing or during the growing season to manage unwanted growth and maintain usable grassland. 

A grass topper uses one or more large horizontal blades and is suited to routine pasture maintenance and relatively light vegetation. A flail mower uses many small swinging flails, producing a finer mulch and coping better with denser, rougher or more varied growth. Toppers are generally simpler and require less tractor power, while flails offer greater versatility and a more even finish. 

Choose a topper whose horsepower requirement, PTO speed, linkage category and weight match the tractor. Its cutting width should cover the tractor’s wheel track but still suit gateways, transport width and uneven ground. Smaller or lighter tractors need a narrower topper, while higher-powered tractors can operate wider models without excessive strain or loss of stability. 

A single-rotor topper is compact, simple and well suited to smaller tractors and narrower paddocks. A twin-rotor topper provides a wider cutting width and follows uneven ground more effectively across a larger span, allowing bigger areas to be covered faster. It is also heavier and normally needs more tractor power and lifting capacity.