Pruning Rosa Rugosa Roses, help!
deejavu
18 years ago
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plantcompost
18 years agogirlndocs
18 years agoRelated Discussions
Difference - rosa rugosa species v. rosa rugosa rubra
Comments (5)kathy, be on the watch for wilt. When I lived in the Philadelphia area (very similar climates & soils, but slightly cooler) I planted a rugosa hedge which was glorious, and then a vascular wilt killed them. I suspect it was something like a Phytophthora infection, but I never had it checked out by a lab. I also didn't want to use fungicides on it. It's possible a soil drench would've saved them, but I wanted them because I thought they were going to require very little care. Not so, not in that climate and soil (also not a sandy one). My impression is that they sulk in hot sticky summer weather. They're ubiquitous up here in the Boston area and they grow quite nicely here....See MoreRosa Rugosa Help Needed
Comments (3)Hi Kelby: I would get $1 distilled water, and 50 cents of RED cabbage. Boil chopped RED cabbage in distilled water, drain off the cabbage, then pour the hot juice over a sample of soil, taken near the root of your rose. Wait for at least 30 minutes before observe the color change. Compare the color change of the juice of the soil to another sample of one drop of vinegar in red cabbage juice. The vinegar should be bright pink. If your soil is deep pink, then it's very acidic. If your soil is clear, then it's neutral. I see the lowest leaves being yellowish: severe potassium deficiency, most often in acidic soil. I also see nitrogen deficiency in the surrounding grass, most often in acidic soil. If your soil is sticky clay, then magnesium is plenty .. lime pellets will neutralize the acid. Lime pellets is sold $6 per lb. at local stores. If your soil is sandy, then magnesium is most often deficient, then dolomitic lime (has both magnesium and calcium) will neutralize the acid. Rugosa HATES chemical fertilizer. If chemical fertilizer like MiracleGro is used, then Rugosa drops off all the leaves. My Austin Eglantyne has Rugosa heritage .. It dropped all the leaves when I gave it chemical fertilizer. Finally I gave it blood meal, then it was healthy. I would correct the pH of the soil first, through lime pellets (if acidic clay), or dolomitic lime (if acidic sandy soil). Both are sold at Kelp4Less, free shipping. Good luck with your Rugosa. My brother has acidic clay in MI, and addition of lime made a big improvement in his crops. Here is a link that might be useful: Kelp4Less Hydrated Lime and Dolomitic Lime...See MoreRosa rugosa sucker - No signs of life
Comments (4)How I usually deal with suckers is to pot them up, and sit the pots in water for a couple of weeks. They come out when the rose has either produced new growth, or otherwise shown it has stabilized. Suckers can vary widely in the amount of roots they possess, and usually are getting a fair amount of support from the parent plant that has to be compensated for....See MoreRosa rugosa 'Hansa' does not mature her hips. Why?
Comments (14)I had written this in 1999 to a group of hybridizers in an e-mail: " I had observed that all of my open pollinated seedlings of Hansa seemed to vary widely from Hansa. This suggested to me that Hansa may be self sterile, and that the bees had brought a variety of pollen to Hansa. Normally only the species roses are self sterile. I let it go at that until I read this article: "Hybrids of the Circumpolar Rose By PERCY M WRIGHT, Wilkie, Saskatchewan, The American Rose Annual, volume 21, pages 41-42, (1936). A new range of hardiness in roses comes with the development of hybrids of Rosa acicularis, the arctic or circumpolar rose, which in North America comes relatively far south in districts of severe climate. Apart from the late Dr. Van Fleet's use of R. Engelmanni (a subspecies perhaps less closely related than has been thought), and the crosses with R. rugosa made by F. L. Skinner of Dropmore, Manitoba, R. acicularis, in my knowledge, has not before successfully mingled with the domestic roses. It has obstinately refused to hybridize with the tender races, as Hybrid Teas, for example. The female parent of my crosses was the Rugosa variety Hansa. This is probably not a hybrid at all, as reported, but a pure strain of Rugosa, related to Rugosa as the double-flowering strain of R. blanda, known as Mrs. Mina Lindell, is related to Blanda. The ordinary Rugosa dies to within a few inches of the ground in most winters, but Hansa is so much hardier that in my plantation it has lost but a little of the greenest wood in ten years. It has thirty-nine petals, and is that miracle, an everblooming hardy rose. The color is a violet-red. .................." --------------------------------------------------------- It appears (to me) that he based his conclusion on the observation that it was so hardy. it must be a species. If he is correct and it is not a hybrid it could be self sterile. I no longer have a copy of this paper: "In 1986 P. Cole and B. Melton published a paper which investigated the ability of rose pollen to fertilize flowers on the same bush ( .Cole, P., Melton, B., J. Amer. Soc. Hort. Sci., volume 111, pages 122-125, (1986). The diploid species were all highly self-sterile. None of the 23 diploid specimens exhibited over 4 % fertility and 18 of the 23 produced no self-set seed. They also studied the fertility with pollen from another plant of the same species and found that the diploid group was 50 times more cross-compatible than self-compatible. For roses of higher polyploid level 12 of the 16 studied were no more self-compatible than the diploid group."...See Morelindac
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