Contradiction with Matthew 13:6
In Matthew 13:6, it states that the plants withered because they had no root. Luke 8:6 emphasizes the lack of moisture as the reason for withering.
Matthew 13:6: And when the sun was up, they were scorched; and because they had no root, they withered away.
Contradiction with Mark 4:5-6
Mark 4:5-6 mentions the sun scorching the plants because they had no root, while Luke 8:6 only mentions the lack of moisture as the cause for withering.
Mark 4:5-6: And some fell on stony ground, where it had not much earth; and immediately it sprang up, because it had no depth of earth: