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Peter Kukielski, former curator of the award-winning rose garden at the New York Botanical Garden highlights 150 tough new rose varieties that don't require spraying in his recent book, "Roses Without Chemicals". He rates roses based on his and others experience. He rates Savannah 60/60 for disease resistance, 25/30 for flowering, & 9/10 for fragrance. I highly recommend his book. I'm in the process of getting this and other roses he recommends. I live in Seattle, black spot heaven and don't spray. I have a lot of roses.
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This a beautiful rose. I am seeing some BS on the lower leaves only. The upper, more visible foliage is not only clean but also a very nice medium to dark green color. The plant has a nice growth habit, growing outwards rather than straight up, and is densely foliaged.
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It's a terrific book. I look at it often and have taken some of his suggestions.
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Now, after growing 'Savannah' for two seasons, I doubt I would keep it if I did not have a granddaughter of the same name. For me, this has been a small, slow growing plant which has not bloomed all season, and it is prone to BS.
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That's odd, since you're in the same area that Kukielski was in. I wonder what he was doing to get it to go well.
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There is a big difference of ambient temperature. The New York Botanical Garden is in The Bronx, NYC, USDA zone 7b; I am in the Mohawk Valley, zone 5, and in a frost pocket. Also consider the way a large city gathers heat.
I think 'Savannah' is a slow grower which simply needs a mild climate, maybe 6b or warmer would be my guess. It is "hardy" in the sense that a few twigs survive the winter freeze, but grows back veery slowly. I have climbing HTs which grow back from winter much faster.
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If you have time, it'd be handy information if you could make a garden listing of which roses you've found to do well.
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Available from - Rogue Valley Rose Nursery - selling & also part of 'free' rose offer
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