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e in NS (or in a new wave of invasiveness)=C2=A0 sometime after 2000.
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<span style=3D"font-size: medium;">Most store roses are grafted unto a r=
ootstock David.</span>
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<span style=3D"font-size: medium;">The rootstock will be undefined in mo=
st cases but we know<br/></span>
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<span style=3D"font-size: medium;">Multiflora roses are popular for good=
reasons! The grafted<br/></span>
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<span style=3D"font-size: medium;">part - top - will usually be inferior=
in hardiness and other aspects to<br/></span>
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<span style=3D"font-size: medium;">the rootstock so the top dies - the r=
oots send up shoots and then<br/></span>
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<span style=3D"font-size: medium;">you have a Multiflora rose ready to g=
o!<br/></span>
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<span style=3D"font-size: medium;">You can obtain roses on their own roo=
ts - hardy roses that is  - but<br/></span>
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<span style=3D"font-size: medium;">not at the local store!<br/></span>
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<span style=3D"font-size: medium;">Enjoy the rain - it will help the ros=
es.<br/></span>
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<span style=3D"font-size: medium;">Paul<br/></span>
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<span style=3D"font-size: medium;"> </span>
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<blockquote style=3D"padding-left: 10px; margin-left: 0px; border-left-co=
lor: blue; border-left-width: 1px; border-left-style: solid; position: rela=
tive;" type=3D"cite">
On December 6, 2017 at 10:41 AM David Patriquin <davidgpatriquin@gma=
il.com> wrote:
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Another "David" here. An interesting, worthwhile debate. A few =
thoughts.=20
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Multiflora rose, while it had been here 100 years and more, seems to h=
ave taken off recently as an invasive in NS (or in a new wave of invasivene=
ss)  sometime after 2000. Did that stem from threshold changes in dist=
urbance or vehicles of movement, or did a particular line have traits that =
make it especially invasive (or some combination of the two); it seems a ge=
netic study could sort that out. Are there less invasive strains that could=
be used as ornamentals/to attract and feed birds?
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I have conducted some documentation of the spread of R. multiflora in =
the Halifax area, Point Pleasant Park in particular. See=20
<a href=3D"http://versicolor.ca/multiflorarose">versicolor.ca/multiflo=
rarose</a>  
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We might  keep in mind that about 1/3 of our flora is of exotic o=
rigin at least in recent centuries, and mostl of these species are plants o=
f disturbed habitats, perhaps all (except (glossy buckthorn?) are not shade=
tolerant; their introduction since European colonizations reflects  t=
he greater abundance of ruderal species in Europe & Asia because of a l=
onger history of extensive human disturbance than in NA. On the whole these=
immigrants  perform important ecological functions and do not serious=
ly threaten native plant communities. (Surely the loss of weedy species und=
er our now super efficient glyphosate weed control is a big factor in decli=
ne of many species). Perhaps where they do threaten native plant communitie=
s in NS that is a transient process as it likely was for many of the exotic=
species for a period after they first arrived. 
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NS is likely species depauperate because of the short time since the g=
laciers retreated and our relative isolation as a peninsula on the Atlantic=
coast, so in a sense we are "open for business" when it comes to i=
mmigration of new plant species. I think we should be very actively conduct=
ing Assisted Migration, particularly for forest species, to increase specie=
s diversity and resilience in the face of climate change.  Anyway, a f=
ew thoughts for the mix. 
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PS: I have spent some time cutting back multiflora rose  near The=
Bluff Trail trailhead, as it is still not abundant along the rails to trai=
l BLT, and so far there are no exotics once you get 5 m into the trail, so =
it takes little effort at this point to keep it out. I do not have R multif=
lora in my back yard but if I could obtain a non-invasive type, I would wel=
come it both as an ornamental and as bird food.  I do not keep bird fe=
eders because they  encourage everything I don't want, rats, squir=
rels and pigeons amongst them.
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<div class=3D"gmail_extra">
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<div class=3D"gmail_quote">
On Wed, Dec 6, 2017 at 8:49 AM, Randy Lauff=20
<span><<a target=3D"_blank" href=3D"mailto:randy.lauff@gmail.com"=
>randy.lauff@gmail.com</a>></span> wrote:
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