the seeds one has sownOften used figuratively to mean the consequences of one's own actions, as in “you reap what you sow.” 自分でまいた種 emphasizes that the person caused the situation themselves.
JA: これは自分でまいた種だから、最後まで責任を取るよ。
EN: These are the consequences of my own actions, so I’ll take responsibility to the end.