What can I do to hold back the Swallowtail swarms until it's mature enough?

I'm new to the whole butterfly 'thing.' I've gotten as far as recognizing the general family a flutter-by belongs to, and buying just about anything that attracts them and hummers.

Wasps: I have in spades. *Groan of despair!* I understand it's the natural order and all that… but how sad that the wasps will be holding back the Swallowtails! At least the Assassin bugs will eat some of the wasps, too. Fair is fair.

Passion Vine: Did you see on another post that I've got it coming from the canal and crawling on our fence? I pulled a bunch out before my eyes trained on it and I thought "wait… that's not Kudzu!" So I'll let it keep coming.

Morning Glory: To someone like me, those are four-letter-words. They choke everything and never STOP. Is this Dutchman's Pipe going to smother everything? I like the habits of all of my Jasmines, my Coral Honeysuckle, and my Bleeding Heart Vine. The Wisteria reaches for the sun, moon, and stars… free-reaching 20-30' away from its trellis trying to grab my Grapefruit tree! Will this be like that?
Not that it's relevant, but the house came with the Wisteria, and it's planted in the wrong spot (complete shade) So It's got beautiful foliage, and never ever ever ever blooms. I'm afraid to move it because what if it grows even faster and further???

I can give it a lot of room, but I need to know exactly how much. I love yard work, but pruning back the Wisteria 2-3 times a week is just crazy-town.

Milkweed: I just bought twenty of these, 16" tall, on clearance from Wally World for .74 each! (I had two plants last year and noticed how much the flutters love it!) Going in the ground this weekend.

I'm in Zone 9B. Central east-coastal Florida.

Here's the link to my Passion Vine post. I ripped it out! *Gag!* I'll let it come back, if it's willing!

Also, try Mexican Sunflower (Tithonia obtusifolia).
Lots of sun, hot and moderate water ,well drained soil.

I've grown A. gigantea (in the greenhouse), A. durior/marcrophylla and take care of another species, and all are great vines. Yes, they get very thick, and none are for a formal setting without an unreal amount of pruning.

First, let me explain the normal growth on an A. vine. It makes a zillion sprouts that can grow 20ft, easy, in a growing season. Unlike most other vines though, the growing season extends long after most other plants are settling in for dormancy (dry season for the tropical ones, winter for durior. (durior is hardy deep into Zone 4, and is the only temperate climate Aristolochia vine. Snake root is hardy, but not really a vine.) Durior will continue growing until frost, and the caterpillars are still eating.

The following year, 3/4 of the small vines die, and the new growth grows in through the tangled brown stems. One wall of my open building is thick enough with vines that some birds have nested there. The vines is a twiner that only grows up. Any vine that is not growing a little bit vertical dies. It will grow long whips looking for something to twine on, but after a couple of feet, the tip dries and the vine quits growing at that point. If you attach this whip to something, almost every leaf axil grows a vine. for this reason, it takes pruning well, indeed, it improves the look from where I sit.

When the butterflies hit the vine, you will understand the lush growth. The volume of foliage eaten borders on criminal. Sometimes the thickly shingled leaf wall gets windows cut through the foot-thick greenery. Then the birds come in and thin the larva, and the vine grows the hole shut. One evening I thought some of the birds had lost whatever brain a bird has. Blind birds was the first thought that came to mind. These birds were flying into the vine like you see a bird flying into a window. Over and over, some birds were flying headlong into the vine without slowing down.

After watching a wile, I was able to figure out that the stems of the leaves are not visible from the outside. Each heart-shaped leaf hangs like a shingle over the top of its lower neighbor. The birds knew the approximate area of the stem, but couldn't hover to find them exactly. When they flew into the vine, their feet were out to catch the first stem to slide through the claws. from that perch, they can look around and grab any close by caterpillar. Out of the hundreds of small caterpillars I see, only a few get to fly away. Sometimes there are a dozen chrysalis hanging from the rafters, but something gets most of them. Here's one just drying its wings:

The species I'm familiar all make a 6 sided (or is it 8?) bolus with a zillion seeds in it. Durior doesn't make too many seed pods, but the tropical ones seem to go gaga making pods. they never grow up from a root like Wisteria. They tolerate some shade, but it is nice if you have a tall place for them to climb. Chicken wire string up between sturdy poles, or a wall of an outbuilding is ideal.

The pic is of a building 12X14. This is one vine after a dozen years.

I think you could grow A. gigantea in Z9. I really like my durior (got rid of gigantea, it is too big for my greenhouse) and would recommend them highly.

I saw at Rockledge Gardens in the butterfly house that they had Tibouchina, so I got one yesterday. They also had a Wild Lime, but didn't have any for sale.

In the fall, I added four red Porterweed, too. They haven't grown much yet, but should be pretty popular once they do!

Leafhead, I just realized I missed your question regarding Cassia. I have seeds for Candlestick (Cassia alata), Winter Cassia (Senna bicapsularis), Golden Shower/ chain Tree (Cassia fistula), Pink Shower/Pink Lady (Cassia javanica).

Purple, remember I don't know any local gardeners personally. I've seen Butterfly Bush in St. Augustine, but it's part of their garden tour thing. I've seen it behind people's fences, and I wish I were a door-knocker plant-beggar, but I'm just not. They're not a pest as far as I can tell, they're just sorta scarce.
Emailed regarding trade!

Leaf, can you tell me anything more about the Cassia? Does it grow fast from seed? Would it be suitable in a large pot in the garden to stop it from becoming 50' trees?

As for the Buddhlea, I looked it up. It says that it "can become invasive in wide open areas or disturbed land."

I will admit I'm not sure what that means. Maybe I'll grow it in pots so I can control it?