Shorten carefully avoids the lettuce

To prove just how long this election campaign will run, ABC Adelaide has set about growing crops.

Each time a politician comes on to chat, they're made to plant some seeds.

For Labor's Chris Bowen, it was bean-sprouts.

Deputy Liberal leader Julie Bishop chose to get her hands dirty with radishes.

When Labor leader Bill Shorten dropped by the studio on Tuesday morning during a campaign visit to South Australia he was torn between two choices.

Lettuce or spinach?

After causing a storm earlier in the year over some awkward small talk in a supermarket's vegetable section, he carefully avoided the lettuce.

His pot plant will join the others in the "hot-house", including Christopher Pyne's leeks.

"That's funny - they normally get the police to chase him," Mr Shorten joked.