What wastes do plants excrete via their roots?

Hydrogen ions— this causes soil to acidify over time, which is why the addition of lime or other alkalizing materials is encouraged for soil that's been gardened on for a long time. This is in contrast to the Nitrogen, Phosphorous, Potassium, and other elements like Magnesium and Iron that the roots take out. read more

Plants do excrete waste through their root systems into the soil or growth medium. As plants respire they require CO2 and excrete oxygen as a waste product through their leaves,stems and roots.Some leguminous plants excrete and set nitrogen into the soil through their roots,which is highly beneficial for soil fertility. read more

When it's time for the plant to excrete waste, it has 2 methods of doing so. The first and most common method is through the roots. A plant pushed the excrement through its roots into the ground. read more

Plants break down waste products at a much slower pace than animals. They convert a lot of their waste into useful substances through photosynthesis. Gaseous wastes are excreted during respiration through the plant's stomata and root cell walls. At night, when photosynthesis cannot occur, excess water is released through the tips of the leaves. read more