Markus,
We are actively working on the weed detection features and functions to get to full Weed Detector functionality. Currently the weeding functionality has not been fully tested or completed QA because it is still under development. Please be patient with us as we close the gaps in our current development of the weeding sequences.
We are also actively working on developing a new weed trimmer system with Liberty University. With the new weed trimmer system we will simply run the weed trimmer over all the space not occupied by the plants. Each plant will be given a safe zone where they can exist. Everything else will be essentially destroyed by the weed trimmer system. The weed trimmer tool will be safe because it will cut using zip ties.
Check out the prototype video on the FarmBot Weed Trimmer by Liberty University