If you notice mushrooms on the lawn while playing, please remove them using the handle of the fork found in the yellow bucket. Avoid knocking off the heads, as this spreads spores and exacerbates the problem.
If you notice weeds on the lawn at the end of the game, please use the weed remover in the yellow bucket to pull them out. Then, fill the hole with the seed and soil mix found at the bottom of the bucket.