Funny, I bought two new Buddlea (sp?) plants the other day.......I'd never had any before, but always wanted some. The flowers look very similar to your's Linz, mine are 'Pixie Blue'. Anyway, they were only out of the car about four or five minutes and a Peacock butterfly landed on one.
My eldest son (6) was sure the butterfly had followed us four miles from the nursery.

I've planted mine near some Cotoneaster which has been a real draw for hoverflies, wasps and bees over the last six weeks (creating a constant drone on quiet days), and also near some spearmint which is just coming into flower, and attracts lots of butterflies too.
It's great to see lots of wildlife in the garden, isn't it, particularly if, like us, you have done much to improve the environment for them. Our garden was just rough grass when we moved here, with no shelter from the winds. There were three Laurel shrubs which wre about three feet high, and a stone dyke around the perimeter.
It's not a big garden........probably about thirty feet by forty feet, then a smaller bit nearer the house.
I planted a mixed hedge with anything I could beg or find, including Hawthorn, Privet, Oak, Ash, Cotoneaster Ceanothus, and the original Laurel, and they've all grown into a hedge around ten feet high which really shelters us from the winds. I trim it a bit on the garden side to keep the kids' area safe, but other than that it just does its thing.
I planted two Gean trees from wild seeds and the first one is about 18 ft high now, and lots of ornamental grasses, berry bushes, clematis, ivy, forsythia, and honeysuckle.
We have a phenomenal amount of insects now, and a lot more bird species too. From the original dunnocks, the bird population has expanded to blackbirds, robins, wrens, four species of tit, several species of finch, tree sparrows, wagtails, and even wood pigeons which are nesting in one of the laurels as I write. We feed them all a bit through the winter, but not in the summer.
Sometimes the local sparrowhalk sweeps through, but that's just part of the whole thing, I suppose.
I have dabbled a bit in growing some simple veg, but I need an education in that area.

We have horses here, and plenty of space outside the garden, so I really should get on and grow more veg.