Seeds of conflict.
Example:
We should realize that we sow dragon's teeth when we neglect the education of our children.
This term often appears in the phrase "sow dragon's teeth," which means to create the conditions for future trouble. In an ancient Greek legend, Cadmus killed a dragon and planted its teeth in the ground. Armed men immediately sprang up from where the teeth were sown and tried to kill him. The goddess Athena directed him to throw a precious stone into their midst and they proceeded to slaughter each other until only the five greatest warriors were left, and these became Cadmus's generals.