A. Paulownia are the Formula 1 of trees. If everything is properly attuned to provide them their best potential for growth they will be faster than any other tree. However they are exacting in their requirements. Having said that, there is a lot that can be done to improve conditions, such as cultivation to increase drainage, adding fertiliser and irrigation, which will make a huge difference to the outcome. If you are looking for a tree to throw in the ground and walk away from they are not the right choice. There are easier trees to grow but these will not match Paulownias’ growth under conditions suited to Paulownia. Just as for any crop, suitable land and climate should be selected.