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This is great information, I've wonder how own roots look verses grafted but I could'nt bring myself to uprooting to check. Thank you for sharing.
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HMF won't let me post link, so I have to re-type the whole thing: MULTIFLORA rootstock declines after 5 years, and MULTIFLORA CANNOT GIVE ME ANOTHER OWN-ROOT ABOVE the grafted-junction LIKE DR.HUEY in heavy clay. Dr. Huey's lifespan is short in cold-zone with poor drainage clay. Local rose-park replaces their Austins every 3 years. Comparing Dr. Huey-rootstock, Multiflora-rootstock, and Fortuniana-rootstock from link entitled "An overview of fortuniana".
"Here in the Desert Southwest, with our generally alkaline soils and extreme temperatures, we find that r. multiflora has a shorter life span, losing its vigor after five years. While fortuniana bushes had superior root systems, they had difficulty with the harsh & cold English climate.
In a study over several years, Dr. McFadden budded two hybrid tea varieties, Queen Elizabeth and Tiffany, onto three different rootstocks. After counting the number of blooms produced over many growing seasons, the varieties budded onto fortuniana produced significantly more blooms. The fortuniana plants produced about THREE TIMES the number of blooms as those on multiflora and TWICE as many as on Dr. Huey.
Additional benefits of Fortuniana include increased resistance to gall, stem dieback, and root disease, such as Phytophtora and Pythium. Bushes planted over 40 years ago in Florida are still thriving."
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I have roses on four different rootstocks in my slightly-acid soil, which overlies clay - Dr Huey, Multiflora, Fortuneana and R indica major. And all of them produce understock shoots. I prefer to have roses on their own roots, except for those which will sucker, which is mainly Old European roses, most species, Rugosas. I'm in zone 9b, which is a different situation of course.
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Thank you !! I edit my info. to specify that Multiflora cannot give me an own-root Comte de Chambord rose from ABOVE the grafted junction in my heavy & alkaline clay .. Dr.Huey is more vigorous here so own-root-roses can sprout from ABOVE the grafted junction, such as giving me a second OWN-ROOT Pink Peace from the Pink Peace (grafted on Dr.Huey).
Note that giving a second OWN-ROOT plant ABOVE the grafted junction is different from SUCKERING BELOW the grafted junction. Suckering simply gives another Dr. Huey, or another Multtiflora. But sprouting another own-root from ABOVE the grafted junction means I get a second plant true to what's above the grafted joint.
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