A cutting with a 'small root' could be planted in the ground, depending on just how small that root is. If it has barely begun to root, someplace more protected than your Z5 garden bed might be a better place for it, i.e. semi protected porch, cold frame etc.

The seeds are removed from the pods. They need a period exposed to cold moist temperatures before they will germinate so you could direct sow now while it's comfortable to be outside, sow in pots in winter and place the pots outdoors for germination in Spring, or sow and use your refrigerator to provide the cold moist period - Campsis radicans: sow 2 months @ 39ºF, move to 70ºF for germination.

If your neighbor is growing the vine you must know in some climates it can get large and have an attitude :)

I actually bought some yellow trumpet vine that I will be planting in containers. If you google it, you will find that it is incredibly invasive and hard to get rid of once it has set in.

In zone 5, I doubt that Campsis will be very invasive. That is about as cold as they will go at all. They are a horrible problem from zone 8 South but not bad at all for me here on the zone 7-6 border.

George

My yard is zone 6 or maybe 5 (I'm in a frost pocket) and it is very invasive. We have it growing to attract hummers, which it does very well, but I warned my wife "it's beautiful, but you can't get rid of it". My grandmother had it while I was growing up and you had to trim it back severely EVERY year, or "it will pull the shingles off the barn" was the warning. I think it could have pulled the whole barn down if it was left alone. Be careful where you put it.
JMO,
Tom

I'm in 7a and it's impossible to get rid of once it's become established.

I had trumpet vine on 3 sides of my yard for twenty years. My neighbors had it growing in their fence lines because they didn't care about it, they are renters. It is HORRIBLY invasive and when you cut it back, it starts new shoots underground. Even worse than bamboo. I probably spent 40 - 50 hours a season just cutting it back as hard as I could. Then I bought some powdered roundup and mixed it double strength and sprayed those vines about 4 times. That got rid of it. It was the first time (hopefully the last) I ever resorted to using poisons in my yard but it was so worth it. If it comes back in the spring, I'm going to spray it again. It was even coming up as far as ten feet away from the original plants. DON'T PLANT IT or I'm sure you'll regret it.

I'm in Zone 4 & Minnesota winters just make this plant go nuts I have seed pods that are 12" to 18" long

I planted mine about 15 years ago in zone 5 MI. and I thought for sure it would cover my picket fence on the property line. It just grows along the top and is easy to maintain. This year I started digging up the shoots from the yard and putting them in water to root. I've given several away, and I think I'll continue doing this to share for the hummers. I've yet to find someone with a pink one though.

Plant them in large pots to avoid them spreading. Simple yes?

Simple, no! What is the plan to control the seed pods?

Ummm, cut them off before they form seeds?

ummm yeah here in zone 8, I am learning the hard way just how voracious this thing is.....we planted two 4" sprouts about 13 months ago, and this is what we have now