CNN
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When you think of roses, you may not think of them as rare. You can easily find commercially grown roses at your local florist or even at the grocery store.
But when it comes to unique heritage roses, there is a world of collectors and preservationists working hard to keep them alive amid numerous challenges including commercial trends, disease, pests and climate change.
Last weekend, a group of collectors gathered in Southern California to bid on some of the rarest roses in the United States. Many roses on the auction block are no longer available commercially – some
