KERRY Austin has his lunch sorted for the week. 

The Nambour retiree and keen vegetable grower couldn't believe the size of the radish he pulled out of his garden yesterday morning.

The 67-year-old said it was about 470mm long and 300mm around, and weighed just less than 2kg.

"I've grown a lot of vegies in my life, but never one this size," he said.

Mr Austin said he believed the specimen to be a chinese radish, also known as a daikon, which can be difficult to come by at Coast fruit and vegetable stores.

The radish had been growing for about two months.

"I saw how big it was getting and just decided to let it keep going," Mr Austin said.

"Everyone I've shown it to says they've never seen anything like it."

The retiree said he planned to cut open the radish for a bite and, depending on the taste, could turn it into a salad.

Radishes are rich in folic acid and potassium, and are a good source of vitamin B6, magnesium, riboflavin and calcium.