Correct twyngwyn.

"He blew it, the dope.  'Twas like a beautiful blue carpet!"

He blew it - Bugle (Hint - consider 'the last post', usually played by bugle)

the dope - weed (as in dope, hooch, MJ etc.)

Bugleweed - Is an excellent low-growing, evergreen groundcover. It spreads by underground runners (or stolons) that form a dense carpet of beautiful blue foliage.