Witchipedia

A Sea Heart, aka Columbus bean, is a bean from a tropical vine (Entada gigas, E. phaseoloides, or E. rheedei). Assuming it liked the environment you provided, it would grow a long, trailing vine, something like a pole bean on steroids, called a monkey ladder.

Sea hearts can be carved on the surface or cut to shape as desired (they are hollow, but their walls are thick) and used to make musical instruments (shakers and rattles) and jewelry and has been used for luck on a long voyage, especially by sea. Also, fertility, longevity, longevity, endurance, general luck. I found one reference that it was used to aid childbirth as well as to prevent conception, but I don't have the details. I did find some research into the medical usefulness various Entada species, but nothing really spectacular. /E. rheedei//, called African Dream Bean is supposed to induce vivid dreams. I would not consume any of these beans, but as charms they are quite nice.