Question: Can I plant Knock Out Rose in a planter? How big it have to be?
Answer: Your Knock Out rose will grow to be about 3 feet tall and 3 feet wide so you will need a large container. Try a 15-20 gallon container (or plant it in a half-whiskey barrel) and it should be fine. Enjoy!
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When singular and plural spellings differ, as in peony and peonies, try both.