The seed-plant-water-grow sequence offers the opportunity to think about the church in the context of gardening or farming. In the painting that is considered his masterpiece, Scottish artist William York MacGregor, shows a vegetable stall filled with cabbages, rhubarb, leeks, potatoes, onions and more. It is a reminder that those seeds that are planted by Paul (or whomever) are seeds for a variety of produce.
William York MacGregor. The Vegetable Stall. 1884. Edinburgh: National Galleries Scotland. For the painting, see: https://art.nationalgalleries.org/art-and-artists/5106. For an x-ray showing the painted-out figure, see: https://www.nationalgalleries.org/research/projects-263/x-ray-of-the-vegetable-stall/changes-in-composition/
But it is what isn't there that makes this painting an even better match for this text. Originally, influenced by Dutch and Flemish painters, MacGregor included a figure in the painting.
One plants. One waters. But it is God who gives the increase.