What does the sacred lotus mean in the language of flowers?
This isn't just any lotus. It's THE lotus. The Sacred Lotus. When you see it blooming all alone in a murky pond, you'll know.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you:
The sacred lotus has (はす) a strong significance (and probably some powers). It has something at least, just remember it has something special going on, and you'll be fine.