Plants, like all living organisms, have basic needs: a source of nutrition, water, air, favorable climate, and light. For most plants, these needs are summarized as light, air, water, and nutrients (known by the acronym LAWN). If a plant does not receive all of these, it will wither and die.
The spiritual life is a lot like growing a garden. To flourish and grow, we need LAWN. Jesus is the source of life.
In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God; all things were made through him, and without him was not anything made that was made. In him was life, and the life was the light of men. The light shines in the darkness, and the darkness has not overcome it. John 1:1-5 (emphasis added)
Jesus provides the light, air, water and nutrients we need to grow and produce fruit.