A closer look at those fields of purple will show us Henbit and Deadnettle. They are relatives and members of the mint family. Both are weeds of no-till crop production and that explains how we can have hundreds of acres of purple in the spring before the farmers spray their fields.
Henbit has rounded leaves that appear to encircle the stem.
Deadnettle leaves are more triangular or heart shaped.
Both plants are edible and have medicinal value. The upper parts of the plants can be cooked as pot herbs, added to salads or used in teas. Gather only plants that have not been exposed to chemicals.