So i have been asked to do the largest weeding and mulching job i have ever received the picture wont upload for some reason, but basically they want me to weed out the gardens or spray herbicide to kill the weeds, then spread the mulch. I'm not sure if this is a good idea to use herbicide due to all the plants they wish to keep. Does anyone use Herbicide in situations like this? if so what kind would you recommend ? They are providing the mulch and having it delivered that was what they wanted to do. How would i estimate the total cost of the job?