These do well planted almost anytime the soil is workable. I like fall planting as it gives them a chance to get somewhat established before winter.
I have a heavy red clay here, but what has been happening is with a straw or leaf mulch over winter the worm population has exploded. The soil is getting darker and the consistency is no longer that of the hard pack clay began with. Its a much finer loamy type now.
You'll also find as you are adding a carbon mulch pill bugs will be attracted. They dig around the choke tubers and create spaces around them. With the worms they'll actively harvest the tubers when stressed, but you will also find your soil becoming better. Usually worms just will go after the part of the plants that are the connecting stems attaching the tubers .
Spring time and its winds dumps a lot of weed seed into my beds, so seed my "chokes" with oat hay in the spring. As its set down, just 3-6 inches works. The oat hay breaks down and the oats get established and provide a ground cover until the chokes start out growing them.
Am finding my black peppermint is creeping more and more into the choke bed and that's not bad, just makes it tougher to harvest.
Hope this helps! )