That is exactly what it takes to be a disciple/follower of Jesus Christ. Often we want to tell others about Jesus, which is planting the seed, and we want to see that person grow instantly. That is where time and patience of the gardener comes into play. Just like the flower or tree we plant years before, it may take time to see those people bloom into the individual that God intended for them to be. Until they bloom, it is up to us to continue to water and give them the care they need until they are able to grow on their own. That could mean praying for/with them, doing bible studies with them. Spending time with them and caring for them is necessary in order to build disciples.
We can't just tell people about Jesus and what Gods Word says and not be willing to put the time in to help them grow as individuals. This could be a lengthy process, but it is a process that is needed to grow Gods Kingdom.
Who are you helping to bloom?