I was told you could plant container plants on into the spring, as long as its where you can water them.
Yes you can plant in the spring. I will plant the first week of May because of other projects that see me back.
You are in Alabama and I am in north Middle Tennessee. Here is what I do to my spring plantings to give them less stress.
1) I use moisture mizer in the planting hole (water absorbing crystals)
2) I use landscape fabric to converse moisture and reduce competition
3) I weedeat the site and spray roundup to set back competition
4) I water them in extremely well when they are planted
5) I water 2 or 3 times the first two weeks
6) I water in the Summer when heat stress arrives
7) I protect them again rabbits and deer with tree tubes
Once planted in the spring, I watch them for new growth. That to me is a sign the roots are doing well.
Prior to planting I get them settle to the sun - I start with 20 minutes a day and work up the full sunlight thru a progression.
Best to start in the shade and move out of shade and increase time length exposed to sun gradually.
I believe MattPatt's growing climate is much harsher than yours and certainly harsher than mine.
I will not plant all of mine in the spring - I will carry some over the summer in my greenhouse and plant them in the fall when it turns cooler.
I hope this gives you some helpful ideas.
Wayne