Intermediate Diploid Perennial Ryegrass (Lolium perenne) is classed as an intermediate heading species on the scale of lateness. As for the other diploid grasses, it has two sets of chromosomes per cell. This helps combine robustness and yield, helps be competitive with weeds due to its fast growth habit. They can cope with lower fertility ground and they can handle wetter environments than tetraploids. This grass is a mainstsy of most agricultural ley mixtures, such as those for paddocks.