Answer: Roses do need full sun. Direct sun all day is best, and six hours of direct sun including the hour of noon is about the minimum needed for good blooming performance.
Tree roses can be grown in a container as long as it is generously sized, has a drainage hole in the bottom so excess water can escape, and you water and fertilize regularly. (Use a slow release fertilizer or a water soluble fertilizer per the label directions.)
Tree roses need special winter protection so growing it in a pot is actually not a bad idea. In late fall after it has gone dormant, bring the plant into a cool but sheltered place such as an unheated garage. The temperature should be above freezing but below 40 to 45 degrees so the plant stays dormant. Water just enough to keep the soil slightly damp, not bone dry. In early spring, take it back outside so it can wake up naturally with the season. Enjoy your rose!
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