If a plant was uprooted, is it considered a Melachah of planting to re-soil it on Shabbath? The simplest example would probably be that a child pulled a plant out of its pot on, or immediately ...
Suppose someone keeps a plant that must be watered daily in order for it to survive. May that person water the plant on Shabbat? Note that this is definitely allowed and even required for pet animals ...
May one urinate on the lawn on shabbat, or is that forbidden the same way that watering it is forbidden? What about defecation? Feces may or may not contain nutrients that are beneficial to the soil ...