What are some more interesting flower habits?

Yes, sunflowers turn to face the sun. (they aren’t the only ones)

Morning glory vines wrap around the trellis using the right hand rule. The vines don’t follow the sun. How do they know?

I “so” read this question in the wrong context loll.

Touch-me-not (Impatiens) is a flower that responds to finger-poking. At the touch of a finger it will burst and scatter seeds in all directions.

This is my favorite!! lol! The gas plant is in a class by itself. On hot days it emits a gas which can be ignited with a match. The effect of a tiny flash of flame, or even a weak “pouf!”, coming from a flower, is more than a little startling.

There are some species of orchid that resemble females of certain insect species in order to be pollinated by deceived male insects.

Skunk cabbage (yes it is a flower) is part of a small group that give off heat.

Mayapple seeds are disseminated by box turtles.

A giant carnivorous pitcher plant was recently discovered in the Philippines that is big enough to occasionally dine on small mammals.

There is a class of perennial flowers called spring ephemerals that come up in early spring in profusion for a few weeks in forests before trees get their leaves and then go back below ground. Examples where I live include Virginia blue bells, spring beauties, blood roots and woodland poppies. Many people are unaware of these flowers. I would encourage people to go outdoors to nature preserves to seek them out.

My mother in law introduced us to four o’clocks. The blossoms open up around 4:00 each afternoon, then close up again to reopen the next afternoon. They are really easy to grow, and even drop their seeds in a way so that if you plant them one year, the next year a new batch of flowers pops up. Also, the seeds are really easy to collect and store, so you can give them away or plant more the following spring.

Surprise blooming Irises! Most Irises bloom in sprng, but these surprising babies hise until summer and then bloom overnight!

The century plant (said to bloom once in a hundred years in the wild) grows 5–6 inches per day. Here is an example.

Most flowers whiter as soon as they’ve bloomed. That means time is precious even for a flower.

Moonflowers are similar to Morning Glories but only bloom at night and are dependant on night flying Moths for pollination. I always plant Morning Glories & Moonflowers every year.

While not specific to flowers, the sensitive plant is one of my favorites.

@Coloma Ive done that. Til’ my trellis tipped over!

I love morning glories and moonflowers, but my new favorite is Gooseneck Loosestrife. All of the curved spikes point in the same direction.

I am going to make my usual pitch to ask people to consider planting native species. Loosestrife, although very attractive, is highly invasive and a royal nuisance in many areas. The thing about invasives is that they cause damage to entire ecosystems. They are not eaten by native insects, causing problems with the insects which in turn causes problems with species that eat insects and so on up the food chain. The book Bringing Nature Home has a good explanation of this along with suggestions on what to plant.