A second situation calls for a twining vine. I have a weathered cedar arbor made of cedar logs, each about as big around as a standard forearm. It is about nine feet high, three feet deep and three feet across (i.e., the opening I walk through entering my garden). With the lichen and weathered wood it is quite attractive as-is, but I would love a vine that would twine around it and flower, preferably fragrant. Clematis don't think are an option since the tendrils are not big enough to wrap around the cedar so I was thinking more of morning glory or a honeysuckle.

Conditions are full sun and good soil.

All suggestions appreciated.

If you added some climbing structure (nails, chicken wire?) you could grow whatever you liked on the arbor.
Chinese Wisteria, grapes or clematis.

Hops is really cool too- but I don't know if everyone enjoys the very aromatic odor it puts out (can smell it a half block away)

Kevin

There is a variegated vine, Silvervein creeper, Parthenocissus henryana, related to but not as vigorous as Virginia creeper, Parthenocissus quinquefolia. It is only hardy to zone 6, and I am not sure how that compares to Canadian zones.

Major Wheeler, a selection of the native honeysuckle Lonicera sempervirens, is really nice, but is a stem twiner, not like Parthenocisus and Hydrangea which have sort of suction cups, so I am not sure how it would work with your arbor. It is fully hardy here.