QuestionWill knock out roses grow under oak trees ? I have tried azaleas and they do not grow well under oak trees because the oaks absorb any moisture in the surrounding area.
AnswerI think you will find that your roses will struggle against the oak tree the same way the azaleas did. However you could plant them in 18 inch wide pots, make a few large drain holes in the bottom and then they should do okay for you. I am assuming the roses will get about 5 hours of full sunshine.