Here the Wild Gardener address the Moonflower here!
From thewildgardener.com in regards to his book, illustrated by Jean Jenkins:
The Moonflower (1997) – When the sun sets and the moon shimmers above, the night comes alive. Bats swoop, hawkmoths flit, owls hunt, and the moonflower unfurls for its one night in the moonlight. This is a great book to introduce children to the marvels of nature, wonders that seem to come alive when the sun begins to set. Still in print!