Big hostas, purple-blue Japanese irises and hundreds of astilbes lined our route, but the overriding impression was tree after tree of rare greenery, hard to identify at 20mph.

• 大株的玉簪属植物、紫蓝色的日本鸢尾和成百的落新妇属植物分布在沿途道路旁，不过，给人印象最深的，是稀有植物一棵接着一棵，20英里的时速很难辨认。