Answer: You can plant the roses regardless of the tree roots. The roots of the roses will find their way around the existing roots. Of bigger concern is that the tree roots may send up suckers if you water the area after planting your roses. If you know the tree roots are dead, water won't be a problem but if you've only recently removed the tree, the roots may still be alive and may send up suckering growth - just something to look out for!
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