I want to buy Double knockout Rose trees. Is there anything that I should know about them that might be a problem?
Thank you for your time and information.
Answer
From what I have been able to read, the Double Knock Out tree roses are generally hardy from zones 4a through 9b. However, there are some facts about their cultivation that I found that would be of interest to you. Hope this helps.
Winterizing
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Tree roses, because of their grafted nature, may be somewhat less hardy than regular roses. To maximize the rose's chances of survival in cold winter areas, plant where the tree rose will be protected from cold winds. In the late fall, prune the rose, and plant tall, sturdy stakes on either side of it. Wind burlap around the stakes so the entire tree rose is completely enclosed. Secure the burlap with string or staples, and fill the space around the tree rose with shredded leaves, hay or other organic material.
Other Options
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If you grow your Double Knock Out tree rose in a pot, it can be winterized in a minimally heated cellar or garage where the temperature will remain around 40 degrees Fahrenheit. Water occasionally to keep soil moist. Tree roses can also be buried, pot and all, in a shallow trench. Turn the pot and rose on its side, place in the trench, and cover with soil topped with mulch or hay.