teeth are sown.

In his "Age of Fable," Bullfinch gives us a graphic picture of the scene:
"At the time appointed the people assembled at the grove of Mars, and the
king assumed his royal seat, while the multitude covered the hill-sides.
The brazen-footed bulls rushed in, breathing fire from their nostrils that
burned up the herbage as they passed. The sound was like the roar of a
furnace, and the smoke like that of water upon quick-lime. Jason advanced
boldly to meet them. His friends, the chosen heroes of Greece, trembled to
behold him. Regardless of the burning breath, he soothed their rage with
his voice, patted their necks with fearless hand, and adroitly slipped
over them the yoke, and compelled them to drag the plow. The Colchians
were amazed; the Greeks shouted for joy. Jason next proceeded to sow the
dragon's teeth and plow them in. And soon the crop of armed men sprang up,
and, wonderful to relate! no sooner had they reached the surface than they
began to brandish their weapons and rush upon Jason. The Greeks trembled
for their hero, and even she who had provided him a way of safety and
taught him how to use it, Medea herself, grew pale with fear. Jason for a
time kept his assailants at bay with his sword and shield, till finding
their numbers overwhelming, he resorted to the charm which Medea had
taught him, seized a stone and threw it in the midst of his foes. They
immediately turned their arms against one another, and soon there was not
one of the dragon's brood left alive."

Having complied with all the conditions set forth by the king, the victor
now turns with eager step toward the grove of Mars, and seizing the golden
prize makes his way back to Thessaly, rejoicing in his glorious success.