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'RADcor' rose Reviews & Comments
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This cultivar is unlike the other Knock Outs in that, as the season goes on, the plant develops a layer of dead flowers covering the foliage. The flowers shed their petals adequately as they go over, but the old sepals accumulate in such profusion that they eventually make the plant look ratty when seen as a whole. The new growth on the other Knock Outs covers the old flower parts left from the earlier flowers of the season, but this doesn't happen with 'Rainbow Knock Out'.
Perhaps in a shorter season than Boston's (Zone 6), there isn't enough time for this layer of dead flowers to accumulate. The rattiness is a product of the tremendous number of flowers this plant produces in a season, and reminds me that profuse flower production and absence of disease aren't the only things a landscape rose needs to look attractive.
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I posted in February that I had had trouble with Blackspot and Mildew with this rose. Early in the spring, I transplanted it from the 18-inch clay pot it had been in, into a half whiskey barrel container. It has looked so much healthier since then. The plant has fairly thick foliage and just a very occasional leaf with blackspot. I have not seen any mildew at all. So my conclusion is the other container was too small and put the plant under stress leaving it susceptible to disease.
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Probably right on. Their immune systems can easily be compromised by preventing them from developing the root mass they require and the resulting foliage mass to protect and feed the plant. In my climate, Iceberg is rather resistant to black spot, but if you prune it too severely and keep it too small, you can actually force it to black spot. The smaller can over heating more easily could also have had a negative effect. The barrel has a greater soil mass which provides more insulation against temperature extremes, hold more water in reserve for the plant, as well as provide more room for more roots, resulting in more leaves and food.
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I love this rose. It blooms all summer long, and I like the way the color changes as the bloom ages. My problem with the plant is that it gets a fair amount of blackspot and also some mildew. This puzzles me because I thought the knock-out roses are supposed to be so disease resistant. I live outside of New York City; we have hot humid summers and my garden is green (no synthetic fungicides). Not sure what to think about this situation. I like Rainbow Knock-Out, but would prefer to grow only varieties that don't have this problem.
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Thanks for taking the time to share your experience.
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Please upload your plant photos directly to the appropriate plant page as there they will get much greater exposure. Thanks !
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#5 of 3 posted
11 FEB 11 by
evan500
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Will do, thanks for the suggestion.
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I purchased two of these last spring based on the reputation of Knock Out (which I grow and love) and its sisters. While the plants are what we expect from the Knock Out series, the flowers fade so badly that the overall effect (which IS the idea of a landscape rose) is quite unattractive- seriously unattractive! At $16.95 each, I am reluctant to pull out the plants and disgard them, but that will likely be the case this year. It is amazing to me why such a rose would be introduced. It just taints the reputation of the Knock Out series.
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#1 of 1 posted
15 OCT 10 by
worknjoe
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I agree with you. These are the ugliest blooming rose I have in my garden. I have four planted in my front yard and will move them to an less prominate location this fall.
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