See here how to install DuPont™ Plantex® RootBarrier
Dig a 70 cm deep hole. The diameter depends on the size of the plant
Install Plantex® RootBarrier vertically, green side to the roots. Make sure Plantex® RootBarrier is folded where the tape has been applied.
Fill approx. 2/3 of the hole with soil (depending on the plant size).