plantain can be used as a cover crop: 
Benefits
Plantain can improve soil, reduce weeds, and provide minerals for livestock:
Soil improvement: Plantain can help loosen compacted soil and improve neglected land. It can also accumulate nutrients like calcium, magnesium, and iron, which become available to the soil when the plant dies.
Weed suppression: Plantain can help reduce weeds.
Livestock benefits: Plantain can reduce the need for deworming livestock. It also contains a natural antibiotic compound that can improve animal performance.
Other benefits
Plantain can tolerate drought and heat, and it can thrive in poor soils. It also has natural deworming and antibiotic properties.
How to grow
Plantain can be broadcast sown or drilled. The seeds should be sown 0.25–0.5 inches deep.
How to terminate
Plantain is a perennial, so the preferred method of termination is tilling. No-till growers can use plantain as a cover crop, but crimping will not be enough to kill it.