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Avatar for wendit
Jun 6, 2020 11:31 AM CST
Name: Travis
Seattle (Zone 8b)
Would planting own root rose very deeply increase their winter hardiness? I'm thinking to try some own root in zone 4/5 of Minnesota. Burying the first couple forks. Even with cane die back, the "crown" would be protected. What are your thoughts?
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Jun 6, 2020 5:21 PM CST
Name: seil
St Clair Shores, MI (Zone 6a)
Garden Photography Region: Michigan Roses
For cold climates burying deep is recommended. The depth usually varies between 4 and 6 inches depending on zone and severity of winters. If you get dependable lasting snow cover you shouldn't need to go any deeper than that. Snow is the best protector.
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Jun 6, 2020 9:30 PM CST
SW Ohio River Valley (Zone 6b)
Oh. I didn't know I should be burying my own roots, just my grafted! Live and learn.
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Jun 7, 2020 9:49 AM CST
Name: seil
St Clair Shores, MI (Zone 6a)
Garden Photography Region: Michigan Roses
Yes, for grafted roses you want to protect the graft but for own root you are also protecting the root ball. The deeper planting puts the root ball below the freeze/thaw zone of the soil line.
Avatar for hampartsum
Jun 11, 2020 6:31 AM CST
Name: Arturo Tarak
Bariloche,Rio Negro, Argentina (Zone 8a)
Dahlias Irises Plant Lover: Loves 'em all! Roses
Actually by burying the rose, what one is doing is protecting the crown from the vagaries of harsh winters. The crown is where one finds hidden the dormant cells that will sprout out new canes. The crown area is also where new root buds are kept alive. The crown is the most critical part of the rose for its survival. When one grafts a rose onto different root stock, then one moves upward the cane buds ( above the graft union) whilst the rooting buds are still kept in the rootstock crown. Of course, reducing winter damage to the root ball as a whole is something to consider too.
Burying is just one strategy to overwinter roses. Wrapping up canes with a dry leaf mulch and tarp is another. There are plenty of rose growers here that have found different suitable ways to overwinter roses, including those that lift them and bring them inside or those that grow them in large pots and move from inside/ outside during their short warm growing seasons.
In my place, because I have very mild winters, I don't really have to worry about winter damage. I still keep my bushes with the crown ( or graft union) slightly under my soil line, because my main negative threat are late spring freeze/thaw cycles, that deplete the upper canes of viable buds. Thus protecting the crown or graft union will ensure the viability of my bushes.
Arturo
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