Lovely pic, I think this colour is one of the most difficult to find in Nature. Mostly flowers provide such intense colour. It is great to see a different option than flowers in the challenge. Thanks for promoting the challenge, I'm going back through my set of pics to check what matches. This is my submission for the day:

https://steemit.com/colorchallenge/@guibe80/colorchallenge-saturday-indigo-harry-potter-studio-tour-london