1. Can't remember but Joe ignored it in our garden (and he's 24x7 outdoors)
2. Red deadnettle - good to feed. See https://www.thetortoisetable.org.uk/plant-database/viewplants/?plant=397&c=6#.Wu_2V73TUn4
3. Dock - do not feed. See https://www.thetortoisetable.org.uk/plant-database/viewplants/?plant=134&c=6#.Wu_2x73TUn4