User blog comment:AWPXML/Everything Wrong With Frostbite Caves Part 2 In X Minutes Or Less/@comment-24094226-20150304101042/@comment-26871359-20150304113155

Stunion isn't a complete ripoff of Iceberg Lettuce. Iceberg Lettuce can only chill zombies in FC, not freeze them, so PopCap had to come up with another plant that would take Iceberg Lettuce's place in FC.