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'R. roxburghii' rose Reviews & Comments
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Available from - Wilson Bros Gardens
www.wilsonbrosgardens.com
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This fall, I'm trying to figure out a good site for my R.roxburghii. It is placed in a large growing bag. At first during the growing season it was in full sun with chlorotic yellowish leaves; as I saw no reason for it ,then I fed it generously with a high nitrogen fertilizer and placed it in a semishaded position. Now its covered with deep green leaves. So I wonder if the improvement is due to extra food or to shade. Does anyone have any experience about it?.TYA.
Arturo
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#1 of 5 posted
16 APR 20 by
 Jay-Jay
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I think both. It doesn't thrive in the shade at my place. It needs at least part of the day sun. Maybe not midday sun in Argentina.
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Thank you very much.I'm wondering these days ( since lockdown induces to concentrate...) about the influence of strong sun on roses. This part of the world has in the high atmosphere the largest known UV window. Strong sun is really very strong in summer. The leaves were also bleached (sunscalded, almost white in parts). With increasing evidence of climatic change, I suspect that roses in general and this one in particular may start to show abnormal response to climatic/atmospheric conditions. Perhaps my best option is keeping it another season in the grow bag and move it about during the following grow season.
Arturo
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#3 of 5 posted
16 APR 20 by
Jay-Jay
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I would guess it was the nitrogen. R. Roxburghii on its own roots in 2003 has grown into a healthy 3 metre high plant for me in cool, acid soil, shade, but blooms are few. In 2014 I struck another and put this one in more sun. It is too early to say it blooms more, but the plant is healthy and I would guess that this is a rose that prefers acid soil.
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Thank you Patricia, my soil is quite acid hovering between ph 5.5 up to ph 6 but never above. It is also VERY sandy thus a poor soil that asks for extra food, specially nitrogen I guess that mine grafted onto standard multiflora stock will eventually reach the path of yours. I was speculating around the commonly expressed knowledge that most species roses are forest edge dwellers, growing in the edge of natural forest clearings with part shade. This one being close to original species form one would suppose that it would fit better in a semishaded position. I don't expect it to become a great bloomer, by its intrinsic nature. I'm curious to find how your newer bush blooms with more sun.
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Maybe this is a dumb question, but how do you hybridize with a rose like this? When they have so many petals, how do you pollinate it and how do you collect the pollen?
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#1 of 1 posted
6 OCT 17 by
Plazbo
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how many do with all roses, remove all the petals just before it opens, snip off stamens (to collect pollen).
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Has anyone ever noted six sepals on R. roxburghii plena? Francis E. Lester did. (see the 1942 reference). Checking old long-gone blooms, my photos today show just five sepals (I note the 2003 reference which quotes five.)
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