Vicia segetalis

Narrow-leaved vetch grows best when it receives abundant sun throughout the day, though it can tolerate locations with somewhat reduced light. Native to sunny environments, narrow-leaved vetch requires at least six hours of light daily for optimal growth. Excessive exposure can cause wilting, while inadequate light can produce poor flowering and a decline in health.

Narrow-leaved vetch can adjust to a wide range of temperature conditions, but its distribution may still be limited by different combinations of moisture and heat. It grows best in warm summer climates with sufficient rainfall or irrigation. Extended periods of cloudy, rainy weather or sustained high temperatures can increase the likelihood of Narrow-leaved vetch dying. In winter, appropriate protection from cold can improve the plant's survival rate.

Narrow-leaved vetch benefits from regular, light applications of fertilizer to encourage healthy leaf growth. You should fertilize Narrow-leaved vetch about once a month during the summer. Nitrogen is vital for foliage, and supplying nitrogen-rich sources helps Narrow-leaved vetch thrive.