|How long before you should plant something if you used Round Up to kill what was once there?|
| Roundup is a non-selective herbicide that kills plants only when it's applied to the leaves or stem. According to the manufacturer of Roundup, Scotts-Miracle Gro Company, you can safely replant in an area treated with Roundup a few days after application. Because Roundup does not move through the soil, non-target plants will not absorb the product through their root systems and will remain unharmed. This means that Roundup does not present a threat to future plantings.
According to product labels provided by Scotts-Miracle Gro, it is best to wait at least one day before planting ornamental flowers, trees or shrubs. The company website also adds that you should wait three days before planting lawn grasses, herbs, vegetables or fruits.
Hope this answers your question.