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Old 03-26-2015, 12:58 PM
Location: Living near our Nation's Capitol since 2010
2,144 posts, read 2,804,779 times
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I planted a knock out rose in a 3 1/2 ft tall planter on my deck last spring. It did very well there and bloomed all summer, I love it.

I was just out on the deck and notice that the rose is starting to show signs of life. I am wondering if any of you can tell me if I need to replace all the soil in that container and re-pot it, or should I dig down and remove old soil about half way down and replace it with fresh, or just top dress it and see what happens.

I really want it to flourish again this year. Appreciate any thoughts.
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Old 03-26-2015, 01:22 PM
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No, there is no need to go to that trouble and expense. As I said in another thread about this yesterday, I've had the same container soil in my pots for several years and it is as good now as it was the first season. I just dig in a little compost when I replant the containers every spring. You can do that with your rose, too. Knockout roses will thrive in all sorts of soil, from very fertile to our very heavy Kansas soil. Yours will be beautiful. But because it's in a container, you'll need to keep it fertilized. Twice a season should do it. Knockouts don't ask for much care. The only thing that bugs me about them is pruning them in spring. I have about 20, and this year I had professionals do most of them. Pruning them hurts!
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