We can all plant seeds, or water them.
I have planted, Apollos watered; but God gave the increase. So then neither is he that planteth any thing, neither he that watereth; but God that giveth the increase.
- 1 Corinthians 3:6-7 (KJV)
This takes the pressure of us, as it is God who gives the increase. We just plant the seeds, etc.
With the help of the Holy Spirit these seeds will come to remembrance at the right time.
But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
- John 14:26 (KJV)
So don't underestimate the value of the seeds that you plant. They may save someone's life one day.