katiedee asked:
I've searched on google and I can't seem to find what native plants are threatened by this rose.
what is an example of a plant that this rose would threaten

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They generally don’t mention specific species. ANY that normally inhabit the sunny open areas that the multiflora rose is quickly expanding into will be threatened, as they will lose a one-on-one fight for one particular spot. So, pick any native sun-loving wildflower, and it will most likely have trouble if the multiflora rose moves into its meadow.
And then animals may have trouble, if the plants that they use as a food source start dropping in numbers.
It’s an “ecosystem” issue, not one kind of plant issue. When an invasive “take over”, what grow there, and lives there will change.