You can put your dianthus and phlox in containers and even let them hang over the side. My Mom has hers in a half whiskey barrell. As for the peony, it can be planted in full sun. It may or may not bloom this year...it depends on how young of a plant it is. If you aren't very familiar with peonies, be sure not to plant it deeper than the container it's in. They have a tendency not to bloom if the crown is planted too deep. I have a clematis in a large container that does very well, but wisteria may not work (at least not for long) because it has an extensive root system and grows quite tall. It requires a sturdy structure to hold it as it matures. Perhaps someone had tried it in a container and has had success and will let you know.

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