When Jesus and his disciples passed the fig tree that Jesus had cursed, they saw that it had withered. Jesus used this as an illustration for trusting that God would answer prayer.

Mark 11:20-25

20 The next morning, while they were going along the road toward Jerusalem, they saw that the fig tree that Jesus had cursed had withered completely. 21 Peter remembered what Jesus had said to the fig tree and he exclaimed to Jesus, “Teacher, look! The fig tree that you cursed has withered!” 22 Jesus replied, “You should not be surprised that God did what I asked! You must trust that God will do whatever you ask him to do! 23 Also note this: If anyone says to this hill, ‘Be raised up {Rise up} and then be thrown {throw yourself} into the lake!’ and if he does not doubt that what he asks for will happen, that is, if he believes that what he asks for will happen, God will do it for him. 24 So I tell you, whenever you ask God for something when you pray, believe that you will receive it, and, if you do, God will do it for you. 25-26 25-26Now, I tell you this also: Whenever you are praying, if you have a grudge against people because they have harmed you, forgive them, in order that your Father in heaven will likewise forgive your sins.”