Gynura (longevity spinach)

I live in an area where this plant would not be a perennial. However, I have four cuttings that have rooted in water and I wish to plant them and try these leaves. Is there a good way to do this? Not sure what the root structure looks like. Is container growing an option? I can move containers in the winter. If they would simply languish, should I grow them in-ground and take cuttings for winter storage and try to replant come spring?

i have grown gynera procumbens for several years in zone 8.  i usually will come back in spring but will not handle any freezing weather.
 I usually take cuttings to overwinter inside just in case of cold winters and place into small pots in a south facing window.
Last winter was mild so garden plants came up and grew, potted plants were put aside and grew very large without care. They were in 3 gallon pots I believe and grew up into trees on edge of property.
 They have a mild taste but great added to other salad greens and smoothies etc... They do get thirsty when no rain, but average rainfall usually sufficient.
 If your ground does not freeze you can possibly cut it off at ground level then mount up some soil over roots for cold weather. Tough stuff.

I've also grown longevity spinach in containers in zone 8. I used 10 gallon fabric pots, which proved to be more than large enough for them to thrive. In fact, I have 4 longevity spinach plants going on their 3rd season that are still comfortable in these same pots. The roots have have totally filled the containers out, and would certainly enjoy more room to grow, but nonetheless they are healthy.

Update:

Four of the six stems I received did well. The other two died.  All were the same size when planted. We had an extremely wet year early in season and mainly drought for the last two months. Until we got about a quarter inch of rain a few days ago, we had 0.03 inches in 7+ weeks!. I did water the containers.

The sun is lower on the horizon now and the low temps here are high 40s to mid 50s (F) and the leaves have started to yellow a bit. To overwinter, do y'all cut them back before bringing pots inside or just take cuttings?