My wife pulled up the Bhringraj(eclipta alba) this morning and we found
one ant clinging to the plant just above the soil and aphids attached to
the roots.

This is a new one on me but once I got thinking about it, it seems
pretty logical that this would be quite common.

Live and learn.

The next thing is to id just what kind of aphid.

http://www.flickr.com/photos/phorbin/4998231621/