A square poem has the same number of lines as the number of syllables in each line. Writing poetry gives students a purpose for learning about syllabication. Students learn to use tools like a dictionary or a thesaurus to expand their vocabulary. (Can you tell I love to teach writing poetry?)
I am a third generation public school teacher who has been in education since 1987. I have taught elementary students full time for 20+ years. I am also a freelance curriculum writer. You can contact me at mrs.mjbauer(at)gmail(dot)com.