In the right location Buddleia davidii is a wonderful garden plant and does indeed attract butterflies. The downside is that it seeds around and the seeds germinate readily. Whilst we don't grow the bush, neighbours do and the seedlings are one of the things that I am regularly weeding out. In my area of Scotland the Buddliea is not a great problem and I am not aware of any growing in the wild - we have plenty of other invasive plants instead. However, I can accept that in other parts of the country there could be concerns.

a weed is a plant in the wrong place realy so realy it shouldnt be here but saying that niether should weeping willows .as man makes the world smaller for himself he also makes it smaller for all sorts of species directly or indirectly . i predict bamboo to be the next invasive species to become a problem . nature is a happy balance and a delicate one so realy anything that is in the wrong place will invariably change this balance .

Very true Nosey think of Rhododendron ponticum

I have a small Buddleia, and I do know that the species has some pros and cons. I have chosen it because:

1) Nice and bushy
2) Nice shade of purple clusters of flowers which look nice
3) Butterflies love it.

I have been told that will have to keep taming it, but i think I can do that.

I must also keep an eye on the flowerheads when they die off due to self-seeding.

It is still a baby, but has a few new shoots.

Round my way, the only place it grows 'wild' is on disused sites, railway embankments, and in old stone walls. Enhances those sites. I have to say, I quite admire it, and I use some of the larger flowered varieties in planting schemes for back of the border fountains of colour. Always good to find a plant that performs well almost anywhere. Worthy

We have never had trouble with our Buddleias being 'invasive' at all, I have five different colours and I grow them to encourage butterflys and bees. Because I give them a small prune at the end of the season I dont have any trouble with them.

rhododendrons are smothering everywear in the forest near me and as its the biggest manmade forest in england you can imagine what impact it has or is going to have . you have to admire these hardy plants for adapting and florashing but it doesnt make it right . i think if you had a list of all the species of plants and animals that shouldnt be here youd be quit amazed ie pheasants , rabbits , rats and even wallabies in scotland .