Expert bougainvillea cuttings: so many flowers you see only blooms, not leaves

This year I was too busy with official duties to bother with softwood cuttings of bougainvillea, but I had a promise to keep, so I set aside some time, pruned a few nutrient-rich, sturdy water-red branches, took the most vigorous middle sections as rootstock, and after grafting, stuck them in to root.
Take the more vigorous middle section as the rootstock branch. Ideally the rootstock branch should be nutrient-rich
I used the bark-graft method; of course, you can also use whatever grafting method you are used to and like~
After fixing the joint with waterproof tape, I sealed the scion with cling film in an overlapping-tile pattern. The cling film is very thin, so wrapping two or three layers is fine. You must wrap the scion tightly and seal it well: first to retain water, and second to keep water from seeping into the joint.
I habitually soak it in vitality booster for a day or half a day; just stick the cuttings however you like, you do not have to soak the branches~ As long as you are confident you can root them, that is OK.
After soaking, I, as usual, stick them into floral foam (if the branches are thicker, you can stick them directly into a temporary potting pot, no need for floral foam), and toss them into a transparent storage box. Because they are water-red branches, they root and survive extremely easily, so I manage them in a rough-and-ready way: when I remember, I spray some water; when I forget, I just ignore them.
Half a month later, they root one after another~
They get potted up one after another, and the scions also break through the film one after another~
Just care for them the way you would care for a grafted plant, and remove the film when it is time to remove it~
They grow very fast; because I was afraid they would grow too tall and I would not find a big box to mail them in, I packed them up while they were still this long. But judging from the feedback from fellow gardeners, it is better to mail them after they have grown more mature and their root systems are stronger.
This is a labor-saving, fun way to grow them, and the flowers they produce are also super abundant, with only blooms to be seen and no leaves. Wishing fellow gardeners a great time!