Answer: It depends on the size of the archway and how full you want the plants to look. I would suggest placing one climbing rose on either side of the trellis, because this will give it a more symmetrical look and will fill in the space much sooner than a single plant trained over the top. Remember that is may take a full year for plants to become established in their new homes and perform as expected. Your climbing roses will climb, as soon as they've gotten over the shock of transplanting. Climbing roses don't actually climb, like ivies do. They simply grow long canes that will need to be tied to the trellis to keep them upright.
To get the best plant, follow these buying tips. Look for a #1-grade label on the box for the best quality and size rose. Select roses with at least 3 strong canes. Be sure the canes are firm, plump, and green and there are several strong, moist anchor roots. Avoid roses with brown, shriveled canes or weak roots.
Amity Heritage Roses has a fantastic variety of fragrant, thornless, climbing roses. Request a catalog from them: Amity Heritage Roses, 465 MacArthur Ave., San Jose, CA 95128-2131, phone (408)286-7882, or visit their website and feast your eyes on the roses they carry: http://www.amityheritageroses.com
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