Buddleia davidii. (Butterfly Bush)
Budleja are well known as the butterfly bush. They are very hardy and very easy to grow tolerating nearly any condition.
They grow to flower in summer through autumn having strong scented flowers. Loves by bees and butterflies.
Will come from seed so remove old flowers if you dont want this.
Minimal care needed however can be cut right back after flowering to keep a compact healthy bush.