One Launceston grower, Alison Marshall, will be showcasing her pumpkin wares, which tip the scales a around 100 kilograms.

Ms Marshall said the idea of growing the sizeable pumpkins had taken off with other people requesting seeds to try their hand at the activity.

"My little pumpkin has taken 110 days to get to this size ... I've done very little with it, I just popped it in the ground with [some] alpaca manure," she said.

"This year I've only had one plant and it had three fruits, I am very happy with it, if I had thinned it out to just being one fruit it would have been bigger."

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Tasmanian grower Shane Newitt will be showcasing his two giant pumpkins at the event, put together the pumpkins weigh one ton. The appearance is a rare treat for attendees with the pumpkins normally only showcased in the south of the state.

Show manager Noel Button said the Autumn Show would be a great event for families and children over the weekend.

"We're looking at mostly the produce, we'll have a lot of pumpkins, a lot of produce, the floral art will be extensive and some people are even going to make scarecrows," he said.

"I think these pumpkins will have kids wanting to grow them."

The event is on April 17 from 2pm to 5pm and April 18 from 9am to 4pm at Evandale Memorial Hall.

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