Senna is a well known herb for those with constipation. The seeds are usually the part that is grinded and taken to relieve constipation but it is important to note that this is only for acute constipation and not chronic constipation.
Growing:
Senna is a small tree or large shrub that will need full sun and a weekly deep watering. The plant can be cut back drastically after flowering and will make an attractive feature with its striking yellow flowers.