The event, which will also feature facepainting and activities for all the family, is being organised by Caia Community Gardens Association, which runs the allotments next to Pentre Gwyn Community Centre on the Abenbury Road, where the event is being held.
Heidi Di-Pietro, secretary of the association, said:
"This is a great way for new and experienced gardeners and people on the allotments around Wrexham to come together and share their surplus seeds, plants and we'll also have some experts on hand to give free advice and tips.
"We hope to attract people from the other allotments in Wrexham as well as gardeners who might want to swap plants and seeds."
The allotments at Pentre Gwyn were started just two years ago by a group of local residents and currently all 54 plots are taken. Local Plaid Cymru councillor for Whitegate Marc Jones, who chairs the association, said:
"The allotments here are currently full, as are all the others in the borough. We've got a short waiting list but anyone wanting to join is welcome to get in touch by coming along on the day or by contacting me on 01978 366 735 or firstname.lastname@example.org."
The event is free and takes place between 1-5pm at Pentre Gwyn community centre, Abenbury Road, Wrexham. Refreshments will be available and there is limited parking outside the community centre.