What are the differences between guinea grass and spear grass?

Guinea grass (Megathyrsus maximus) is a tropical grass known for its high forage quality and ability to thrive in poor soils, making it popular for pasture and hay. In contrast, spear grass (Heteropogon contortus) is characterized by its long, spear-shaped seed heads and is typically more drought-resistant, often found in more arid regions. While both grasses are used for grazing, guinea grass generally provides more nutritional value, whereas spear grass is more resilient in harsh conditions. Additionally, spear grass can be more aggressive in certain environments, potentially outcompeting other plant species.