Frederick James decided to write the words "G'day world from Oz" in huge sunflower letters that could be seen from the sky at Innisfail, south of Cairns.
"I thought I'd like to send a message to the whole world and I thought that's what I'll do," he said.
Mr James enlisted the help of his neighbours and a group of seasonal workers from Vanuatu to plant more than 40,000 sunflower seeds on the property.
"It went completely viral," he said.
