What is the capital city of the least populous nation where Himalayan Butterfly Bush grows?
Bhutan: Bhutan ( ; འབྲུག་ཡུལ་ "druk yul "), officially the Kingdom of Bhutan (འབྲུག་རྒྱལ་ཁབ་ "druk gyal khap "), is a landlocked country in South Asia. Bhutan:  Bhutan is geopolitically in South Asia and is the region's second least populous nation after the Maldives. Bhutan:  Thimphu is its capital and largest city, while Phuntsholing is its financial center.
i don't know