Pure speculation but I think Jonah was a gardener prior to his call as a prophet.
How else can the reader understand his roller coaster of emotions in chapter four? When God is merciful and does not punish Nineveh, Jonah plunges into despair and wants to die. He pouts outside the city. God causes a “bush” to grow up rapidly. Its shade provides Jonah comfort; “so Jonah was very happy about the bush” (v.7). The next day God sends a tiny worm to attack the bush so that it withered. Without the bush, the hot sun and sultry east wind hit Jonah so that he wants to die (v.8). Jonah’s passion for a plant reminds me of a gardener’s deep identity with her garden.
Scholars speculate as to what kind of bush it was. The Hebrew word here is qiqayon which is used nowhere else in the Bible. Some think it was castor bean plant which can grow very quickly, up to ten feet in a few months (but not overnight, which is God’s doing in the story). Whatever kind it was, Jonah immediately sees its value. He has it for a day and then it is gone.
After the bush dies, God confronts Jonah again, “Is it right for you to be angry about the bush?”Clearly Jonah valued the bush and its comfort and he makes the judgment that he is angry enough to die. God challenges Jonah’s perspective and judgment.
God said, “What’s this? How is it that you can change your feelings from pleasure to anger overnight about a mere shade tree that you did nothing to get? You neither planted nor watered it. It grew up one night and died the next night. So, why can’t I likewise change what I feel about Nineveh from anger to pleasure, this big city of more than a hundred and twenty thousand childlike people who don’t yet know right from wrong, to say nothing of all the innocent animals?” Jonah 4:10-11 The Message
The book of Jonah ends with this question. The tension between God and Jonah is left unresolved. It is as if God is now the gardener, planting a seed of compassion and mercy in the reader’s heart to see if it will grow. Will it grow in you?
Lord Jesus, Master Gardener, plant and water the seeds of compassion and grace in my life.