It's pick-your-own, not all-you-can-eat, say fruit growers as customers push the limits.

Marlborough fruit growers say pick-your-own berries has turned into gorge-as-you-go for some customers.

Berry grower Andrew Bassett put up a sign reminding customers of picking courtesy after he noticed people taking advantage of the honesty system.

"We believe in fair exchange. The berries are pick your own, not all you can eat," the sign said.

Bassett, who owns a boutique operation at the Pot Shed on Raupara Rd, said he had to step in on several occasions to stop people eating too many berries as they were picking them.

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RICKY WILSON/STUFF Berry grower Andrew Bassett wants people to be courteous when they pick berries.

For Bassett, the berry season was coming to an end this week. He wanted to continue the "picking experience" for customers next season so they could see first-hand how fruit was grown, but the excessive amount of berries people ate while they picked was costing him money.

"We were just getting a bit fed up of people coming in thinking they're entitled to eat as many as they like while they're picking," Bassett said.

"When you get a family and they take one punnet and there's four people picking and tasting as they go, that's where the balance shifts and it becomes unfair for the farmer."

In November 2018, growers in Whanganui were forced to temporarily close pick-your-own berry farms after repeated thefts.

RICKY WILSON/STUFF A sign at the Pot Shed in Marlborough discourages people from eating too many berries.

Bassett said a taste as you were picking was "OK".

"So you can understand what berry to pick ... whether it's dark enough, sweet enough.

"But when it gets out of control, we have to say something. There's a difference between tasting and eating as many as you can."

The only way to prevent theft was to stop the pick-your-own system, and sell the berries through the shop, he said.

That would mean they had to employ pickers, he said.

"People eating as they pick is almost the same cost as me paying someone to pick that punnet."

They made a "little bit" off pick-your-own, enough to carry on next year, Bassett said.

Cherrybank Orchard owner Blair McLean closed up shop for the season on Monday.

On busy days, up to 200 people were picking cherries, he said.

"I'd say 80 per cent of people are good, but there are some that will try and hide cherries in their prams or bags.

"And then there will be a group who go out there and they'll just sit down and gorge themselves ... so you've got to keep an eye on them."

Some pick-your-own customers try to hide cherries in their prams or bags.

There had been situations where they'd had to ask people to stop eating the berries, he said.

In other parts of the country, they charged per person as opposed to the weight of the fruit.

"That's something we've grappled with but haven't done yet."

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