In my opinion Ipomoea is one of the most vigorous vines. Mine climbs the 25 feet long 5 feet tall chain link fence and the fence
will be completely disappears in a few months. That being said, I personally have never found it necessary to help it along by pinching.
It's short internodes simply branch out on its own and form very full foliage I can hardly see the stem.

Today, the same fence is still standing and in good shape but the old achy back is a another story altogether. lol

Ok, I have one Moonflower that has grown from my seeds. It is like 7 feet tall! I haven't seen it bloom yet, gotta wake up at midnight and check it out! I noticed several of the pods were dark so I took the seeds out and have tons!! So, how do I preserve them? It is not a vine like my morning glories, though, it is growing straight up like a stalk. Do they do that?

Rebecca... who has never grown Moonflowers before so not sure what to expect.