Which of these is not a flower?
A Mulberry is a fast growing, medium to small sized tree. Latin name, Morus alba, known as white Mulberry, common Mulberry, black Mulberry, and silkworm Mulberry which grows to 10–20 m tall. It is generally a short-lived tree with a lifespan comparable to that of humans, although there are some specimens known to be more than 250 years old. The fruit of the mulberry is rarely found in shops, so growing your own is largely the only way you will get to enjoy this juicy, tasty treat. Apart from being good to eat, trees make an architectural feature thanks to their spreading habit and crooked, gnarled shape. Tolerant of a range of soils, mulberries can be grown against walls if space is limited.
The other answers are all flowers.