Looking for the name of the purple flowers

I like going for a walk and I do every day except rainy day. I just don't like to get wet.

I found beautiful purple flowers on my walking route. I took pictures and looked for the name in the Internet. Buddleia, that is!!

I found them in the wild but seemed it should be in the some one's garden.
I love the colour and many tiny flowers join together  and makes one big shape of flower.