What climbs a wall or fence vs. trellis?
With a small yard, I'm always interested in gardening vertically but I'm never sure what "climbing" means in plant descriptions. I have a picket fence, several brick walls and two stockade fences (one full sun, the other part). Ivy has pretty well covered one of the stockade fences, and I have a climbing hydrangea on a brick wall (planted two years ago and yet to bloom, to my frustration), but what will climb a relatively smooth surfact versus climbers that need a trellis? I love morning glory, clematis and sweet peas, but believe I would need a trellis for these, correct? What would climb my fences directly? Is it possible to have morning glory climb the very well established ivy, or would that swamp the ivy?
Is there some standardized terminology that would distinguish between supported and self-supported climbing that catalogs use (I haven't picked up on it, if there is...).
Pictures of what works are always enjoyed if you've got them.