Jesus describes the kingdom of heaven by telling a parable about a very small seed that grows into a very big plant. (See: [[rc://en/ta/man/translate/figs-parables]])
Here "kingdom of heaven" refers to God's rule as king. The phrase "kingdom of heaven" is used only in Matthew. If possible, use "heaven" in your translation. See how you translated this in [Matthew 13:24](../13/24.md). Alternate translation: "When our God in heaven shows himself to be king, it will be like" (See: [[rc://en/ta/man/translate/figs-metonymy]])