Flower
noun
The kanji and the word are exactly the same. That means they share meanings as well.
はな
Since this word is made up of a single kanji, it should use the kun'yomi reading. This is the reading you learned when you learned the kanji, so you're good to go. Don't forget to stop and smell the roses on the way, though.
ヒマワリの花はとてもきれいです。
Sunflowers are very beautiful.
母に花をプレゼントしたいんです。
I want to give some flowers to my mother.
花を見ると元気になりますね。
Seeing flowers gives you positive energy.