Juncus anceps

Black rush comes from habitats with plenty of sunlight, for example the shallow margins of ponds and lakes. It prefers full sun but can also tolerate partial sun.

Black rush can tolerate a wide range of temperatures, but its distribution may still be restricted by different combinations of moisture and heat. It grows best in warm summer climates with sufficient rainfall or watering. Extended periods of cloudy, rainy weather or prolonged high temperatures can raise the risk of Black rush dying. In winter, protecting the plant from cold can increase its chances of survival.