premise: Hakea gibbosa, commonly known as hairy hakea or rock hakea, is a shrub of the family Proteaceae native to southeastern Australia. It has become an environmental weed in South Africa and New Zealand, where it had been introduced for use as a hedge plant.
hypothesis: People in America use Hakea gibbosa as a hedge plant.
reason: The sentence says that the plant was introduced in South Africa and New Zealand and used as a hedge plant. There is no way to know, based on the sentence whether or not people in America use it as one or not.