This genus is commonly called Turtlehead, because of the shape of the long lasting summer flowers, which are followed by attractive seedpods. The seeds can be a skin irritant so contact with these should be avoided.
There are six species native to North America, which come from mountain regions and moist woodland. Three of these species are common in cultivation.
They thrive best in a moist soil in part shade or sun. The sunnier the area, the more moisture is required.