> Many weeds store most of their energy/nutrients in deep roots. On the other hand, plants exchange nutrients and also harmful stuff via their root systems. Th

> Many weeds store most of their energy/nutrients in deep roots. On the other hand, plants exchange nutrients and also harmful stuff via their root systems. That's why you plant "companion plants" for other plants to grow quicker. Spraying unwanted plants with sub-centimeter accuracy seems pointless since these plants transfer those chemicals to unsprayed plants. > You cut down the visible part and shortly after that it regrows like it's nothing. If you cut the plant close to the ground, will it really regrow as a properly pruned plant? What if you cut it multiple times, just as it starts regrowing?