I don't have that one but I do have other phlox and they will always be near the top of my favorites list. That one looks very appealing. Sounds like it has a longer bloom time than most.

Yours look happy in that wheelbarrow now but I wonder if they will winter over ok in there since it's metal and it doesn't look like the soil is very deep. I think they would have a better chance in the ground. You could always move some back next spring. They're pretty easy to transplant.

This article at UT Gardens has some good information.

https://utgardens.tennessee.edu/june-2016-plant-of-the-month-phlox-hybrid-wanda/

Looks very nice and that LONG blooming attribute a huge bonus, might be a bit too tender for my far north location, but is worth a try and I'll be sure to give it some winter protection.

If its like any if the many kinds of phlox I have, it will reseed so aggressively you will never have to buy more.