I plan to spray some future landscape beds to kill out everything with round up so that I can plant new landscaping trees, bushes and so forth. Question is how long after I spray should I wait to do my planting? I plan on scalping the area first, then soaking it all down with RU. If I remember correctly round up didnt leave any residue and only affected plant matter by the intake of the chemical with nothing left behind. I don't want to kill $1000 in stuff by planting to soon.