Then a thunderstorm came out of nowhere. The afternoon had been clear and brutally hot, but at sunset a wall of cloud rose behind the western hills and sent a hard wind through the pear tree. By the time Eli reached the house, the first raindrops were striking the porch roof with the sharp sound of thrown gravel. Thomas came out to secure a gate, Ruth ran for the laundry, and Nana Vera remained near the back door with her hand on the frame, listening to the change in the weather.
The rain was brief and fierce. It hammered the clay until the ground looked polished, and rivulets ran along the worn paths between crop rows. Eli watched from the porch, excited by the thought of water reaching the soil beneath his rocks. He pictured the stone cover catching the rain and holding it safely, the way a roof held warmth in a house. When the storm moved east, he went to bed imagining the first clear proof that he had been right.
At dawn he found water pooled on one side of his strip. The stones had formed a little wall against the natural slope, and runoff had collected against the base of two bean plants, leaving their leaves plastered with wet soil. On the opposite side, the tight upper stones had directed water away from the roots, and the earth beneath was almost as dry as before the storm. The arrangement had not caught the rain; it had taught the rain to miss the places that needed it.
He tried removing a stone from the drowned side and discovered the roots beneath had been sealed under a slick cap of fine sediment. One stem had bent sharply, and the other was already discolored near the base. By the next afternoon both plants had collapsed beyond recovery. Eli stood over them with his hands loose at his sides, unable to decide whether the greater injury was the loss of the beans or the realization that he had caused it.
He went into the barn and sat on an empty feed sack until the light became too poor to read the labels on the wall. It was the first time he understood that trying to help something could harm it if he failed to understand what it needed. He had been so eager to keep moisture from escaping that he had nearly prevented water from entering. The difference seemed obvious now, and that made the mistake more painful rather than less.
When Thomas came looking for him, Eli expected anger. Instead his father sat on the other end of the feed sack and removed his hat. "I saw the plants," he said. Eli stared at the floor and admitted that he had packed the stones too tight, though he had known nobody told him to build them that way.
"You didn't ruin the farm," Thomas said, after a silence. "You ruined two beans. I don't have the luxury of making the kind of mistakes you can make right now, but maybe that's why I should let you make them on ten feet." He looked toward the doorway, where the late light was fading. "You have to learn what a thing does before you start counting on it. That's true of rocks and seed and bank loans."